A pi symbol hands on a wall in Nafplio, Greece, July 2021.
| Photo Credit: Taso Katsionis/Unsplash
Mathematics enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is on March 14 every year. The date was chosen because it can be written 3/14 — the first three digits of an infinite number with many practical uses.
Simply put, pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter. It figures into numerous formulas used in physics, astronomy, engineering, and other fields, dating back thousands of years to ancient Egypt, Babylon, and China.
Pi Day itself dates to 1988, when physicist Larry Shaw began celebrations at a science museum in San Francisco. The holiday didn’t really gain national recognition until, in 2009, the US Congress officially designated every March 14 to be the big day in the hopes of spurring more interest in math and science. Fittingly, the day is also Albert Einstein’s birthday.
Pi is considered a constant number. It is also mathematically irrational. Long before computers, scientists such as Isaac Newton spent hours calculating decimal places by hand. The first algorithms that calculated pi up to record-setting lengths of several million digits were based on formulae published by Indian mathematician Srinivasa Ramanujan in 1914.
Today, using sophisticated computers, researchers have come up with trillions of digits for pi after the decimal point, but there is no end.
The number didn’t get its name until 1706, when Welsh mathematician William Jones began using the Greek symbol for the number. It’s the first Greek letter in the words “periphery” and “perimeter,” and pi is the ratio of a circle’s periphery, or circumference, to its diameter.
The number is key to accurately pointing an antenna towards a satellite. It helps figure out everything from the size of a massive cylinder needed in refinery equipment to the size of paper rolls used in printers.
Pi is also useful in determining the necessary scale of a tank that serves heating and air conditioning systems in buildings of various sizes.
Space agencies like ISRO use pi to calculate orbits, the positions of planets, elements of rocket propulsion, and spacecraft communication.
NASA holds its annual Pi Day Challenge online, offering games and puzzles, such as calculating the orbit of an asteroid or the distance a moon rover would need to travel each day to survey a certain area.
As for Einstein: possibly the world’s best-known scientist, he was born on March 14, 1879, in Germany. The value of pi was used in many of his breakthrough theories and now Pi Day gives the world another reason to celebrate his achievements.
The famed physicist Stephen Hawking also died on March 14, 2018, at age 76. And he once said: “One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn’t exist. Without imperfection, neither you nor I would exist.”
V. Naryanan, ISRO chairman (fourth from left), and other dignitaries at the commissioning of O-ARM in Chennai on Wednesday.
| Photo Credit: R. Ravindran
By 2040, India will be among the developed nations in the field of space and would have its own space station, V. Narayanan, chairman of the Indian Space Research Organisation (ISRO), said.
Speaking at the commissioning of O-ARM – a stealth technology equipment for Kauvery Hospital – here on Wednesday, Mr. Narayanan noted that the ISRO looked to place in orbit an independent 52-tonne space station by 2035. “Work is on to building a rocket the size of a 40-story building, which will take people to space…,” he added.
“India is growing in all sectors. I request doctors to adhere to ethics and values, and work to help villagers lead a healthy life,” he further said.
Aravindan Selvaraj, co-founder of Kauvery Hospital, said the O-ARM machine, installed in the hospital’s Alwarpet branch, helped doctors to precisely operate on tumours. It is especially helpful in treating brain and spine and in orthopaedic surgeries, he added.
Doctors who shared their experience said the technology’s precision would help patients get back on their feet faster, and heal better.
Meta Ray-Ban glasses are officially launching in India soon. These AI-powered smart glasses will enable users to make hands-free conversations with the voice assistant, users can ask any question to get real-time answers, listen to music, extract information, and much more hands-free. Including India, the Meta Ray-Ban glasses will also be launched in Mexico and the UAE, expanding their availability to more users. While the company did not reveal any specific date or launch timeline, we expect it to debut in the upcoming months.
Meta Ray-Ban glasses expands live translation feature across market.(Meta )
In addition to the India launch, the tech giant shared a detailed blog post showcasing the new frame designs for the Meta Ray-Ban with Skyler frame and lens colour combos. The company also announced a major software upgrade, bringing new features to the Meta Ray-Ban glasses.
After Meta Ray-Ban’s official debut in September 2023, the AI-powered smart glasses are officially coming to India. Recently, smart glasses were introduced in several European regions and the UK. Now, Meta has planned to expand its availability to more countries, including India. Meta said, “These stylish glasses offer everyday wearability and help you be more present with friends, family, and the world around you by letting you capture a moment or listen to music, while your phone stays in your pocket.”
With the India launch, Meta introduced a new design cat-eye, stylish frame for the smart glasses, which the company says “Skyler Shiny” frame. These frames will be available in Skyler Shiny Black with G15 Green lenses, Skyler Shiny Chalky Gray with Transitions Sapphire lenses, and Skyler Shiny Black with Clear lenses.
As part of its software update, Meta is bringing the live translation feature to all markets. As of now, the translation language supports English, French, Italian, and Spanish. Users just have to say, “Hey Meta, start live translation”, and it will provide a detailed translation without the requirement of a WiFi connection. Furthermore, Meta is bringing Instagram, WhatsApp and Messenger integration to Meta Ray-Ban glasses, allowing users to “send and receive direct messages, photos, audio calls, and video calls on your glasses.” Lastly, Meta Ray-Ban glasses will bring support for additional music platforms, including Spotify, Amazon Music, Apple Music, and Shazam.
Staying cool and comfortable becomes a top priority with soaring temperatures, and investing in the right air conditioner is essential. With numerous options flooding the market, finding the best AC under ₹35,000 can be overwhelming. To simplify your search, we’ve curated a list of the top 8 air conditioners from renowned brands like Voltas, Carrier, Godrej, Lloyd, Hitachi, and Blue Star.
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These models combine energy efficiency, advanced features, and durability to suit diverse needs and room sizes. Whether you’re looking for smart Wi-Fi-enabled ACs, convertible cooling modes, or long-lasting warranties, our recommendations have got you covered. This is our detailed guide to discover the perfect AC for your home this summer season!
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Voltas 1.5 ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0CWVDXYX1″ data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1″ data-vars-formatType=”” data-vars-index=1 data-vars-position=”1″ data-vars-recommendation-tag=”Best overall AC”>
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The Voltas 1.5 Ton AC is a versatile cooling solution with a 4-in-1 adjustable mode for customized comfort. Its inverter compressor ensures energy efficiency, while the copper condenser offers durability and rust resistance.
With high-ambient cooling up to 52-degrees Celsius, it’s perfect for extreme climates. Though cooling speed and noise vary, its sleek design and value for money make it a reliable choice for medium-sized rooms.
What buyers are saying on Amazon?
Cools rooms quickly and looks sleek, but installation and noise levels vary.
Why choose this product?
Offers flexibility, durability, and energy savings, backed by a 10-year compressor warranty.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Carrier 1.5 Ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0DSWR3DJ3″ data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3″ data-vars-formatType=”” data-vars-index=2 data-vars-position=”2″ data-vars-recommendation-tag=””>
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The Carrier 1.5 Ton AC is a tech-savvy cooling solution with Wi-Fi connectivity, allowing you to control it remotely via your smartphone or voice assistants like Alexa and Google Home. Its 6-in-1 convertible cooling technology lets you adjust cooling capacity (from 40% to 110%) based on room size or heat load, ensuring energy savings of up to 50%.
The PM 2.5 filter and anti-corrosion blue-coated copper condenser enhance air quality and durability, making it ideal for extreme climates (up to 52-degree Celsius). With features like stabilizer-free operation and refrigerant leakage detection, it’s a smart, reliable choice for modern homes.
What are buyers saying on Amazon?
Smart features like Wi-Fi and PM 2.5 filter are impressive, but some units are defective or noisy.
Why choose this product?
Choose this AC for its smart connectivity, advanced cooling options, and durable design, making it perfect for tech enthusiasts looking for energy efficiency and convenience.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Godrej 1.5 Ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0DR327PJK” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK” data-vars-formatType=”” data-vars-index=3 data-vars-position=”3″ data-vars-recommendation-tag=””>
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The Godrej 1.5 Ton AC is a reliable cooling solution with a 5-year comprehensive warranty, offering peace of mind for long-term use. Its 5-in-1 convertible cooling technology allows you to adjust cooling capacity (40%–110%), ensuring energy savings and customized comfort. The hydrophilic blue fins on the copper condenser enhance durability and performance, even in high temperatures (up to 52°C).
With features like anti-microbial self-clean technology and i-Sense remote sensing, it ensures clean air and precise cooling tailored to your location. While installation and service experiences vary, its low noise levels and sleek design make it a great value-for-money option.
What are buyers are saying on Amazon?
Excellent cooling and quiet operation, but installation and service need improvement.
Why choose this product?
Choose this AC for its 5-year warranty, customizable cooling modes, and durability, making it ideal for those seeking long-term reliability and energy efficiency.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Lloyd 1.5 Ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0CCY3HLCV” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK,B0CCY3HLCV” data-vars-formatType=”” data-vars-index=4 data-vars-position=”4″ data-vars-recommendation-tag=””>
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The Lloyd 1.5 Ton AC combines sleek design and advanced features like 5-in-1 convertible cooling and PM 2.5 + anti-viral filters for superior air quality. Its inverter compressor adjusts power based on heat load, ensuring energy savings and consistent cooling. The blue fins evaporator copper coils resist corrosion, enhancing durability and performance, even at high ambient temperatures.
With a turbo cool mode and hidden LED display , it offers both functionality and aesthetics. While installation experiences are mixed, its quiet operation and cooling performance make it a strong contender for medium-sized rooms.
What are buyers saying on Amazon?
Fast cooling and sleek design, but installation can be hit or miss.
Why choose this product?
Choose this AC for its superior air filtration, quiet operation, and durable design, making it perfect for health-conscious buyers with medium-sized rooms.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Lloyd 1 Ton 5 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0BRKXFVVJ” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK,B0CCY3HLCV,B0BRKXFVVJ” data-vars-formatType=”” data-vars-index=5 data-vars-position=”5″ data-vars-recommendation-tag=”Most energy efficient”>
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The Lloyd 1 Ton 5 Star AC is an energy-efficient cooling solution designed for small rooms. Its 5-in-1 convertible cooling technology offers flexibility, allowing you to adjust cooling capacity for optimal energy savings. The anti-viral + PM 2.5 filter ensures clean air, while the inverter compressor provides consistent cooling even at high temperatures.
With a sleek design, low noise levels, and a 5-star energy rating , it’s an excellent choice for compact spaces. However, installation and functionality issues have been reported by some buyers.
What are buyers saying on Amazon?
Impressive cooling and energy efficiency, but installation and remote issues noted.
Why choose this product?
Choose this AC for its energy efficiency, advanced air filtration, and compact design, making it ideal for small rooms and eco-conscious buyers.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Carrier 1 Ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0DSWRQRNZ” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK,B0CCY3HLCV,B0BRKXFVVJ,B0DSWRQRNZ” data-vars-formatType=”” data-vars-index=6 data-vars-position=”6″ data-vars-recommendation-tag=”Best value for money”>
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The Carrier 1 Ton AC is a smart and energy-efficient cooling solution designed for small rooms. Its Wi-Fi connectivity allows remote control via smartphone or voice assistants like Alexa and Google Home. The 6-in-1 convertible cooling technology lets you adjust cooling capacity for optimal energy savings of up to 50%.
The PM 2.5 filter ensures clean air, while the anti-corrosion blue-coated copper condenser enhances durability and performance in rising temperatures. With features like stabilizer-free operation, refrigerant leakage detection, and auto cleanser, it’s a reliable and feature-packed choice for modern homes.
What are buyers saying on Amazon?
Smart features and good cooling performance, but some units are defective or noisy.
Why choose this product?
Choose this AC for its smart connectivity, advanced cooling options, and durable design, making it perfect for tech enthusiasts looking for energy efficiency and convenience.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Hitachi 1 Ton Class 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0DQTVHP1G” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK,B0CCY3HLCV,B0BRKXFVVJ,B0DSWRQRNZ,B0DQTVHP1G” data-vars-formatType=”” data-vars-index=7 data-vars-position=”7″ data-vars-recommendation-tag=”Newest model”>
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The Hitachi 1 Ton AC is a compact yet powerful cooling solution with Xpandable+ Technology for enhanced airflow and faster cooling. Its FrostWash Technology ensures odour-free and clean air, while the 4-way swing provides uniform cooling across the room.
The inverter compressor adjusts power based on heat load, ensuring energy efficiency and consistent performance. With a 5-year comprehensive warranty and durable 100% copper condenser, it’s built to last. While installation experiences vary, its sleek design, quiet operation, and affordability make it an excellent choice for small rooms.
What are buyers saying on Amazon?
Excellent cooling and energy efficiency, but installation and service need improvement.
Why choose this product?
Choose this AC for its compact size, advanced air filtration, and quiet operation, making it ideal for small rooms and eco-conscious buyers.
₹35000 for this summer season: Top 8 picks we suggest from brands like Voltas, Carrier and more” data-title=”Blue Star 1.3 Ton 3 Star” data-vars-multiProductFlag=”false” data-vars-amazon=”B0BW9D8YSQ” data-vars-flipkart=”” data-vars-ajio=”” data-vars-singleamazonadlist=”B0CWVDXYX1,B0DSWR3DJ3,B0DR327PJK,B0CCY3HLCV,B0BRKXFVVJ,B0DSWRQRNZ,B0DQTVHP1G,B0BW9D8YSQ” data-vars-formatType=”” data-vars-index=8 data-vars-position=”8″ data-vars-recommendation-tag=””>
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The Blue Star 1.3 Ton AC is a versatile cooling solution with 5-in-1 convertible cooling technology, allowing you to adjust cooling capacity for customized comfort. Its anti-corrosive blue fins ensure durability, while the inverter compressor delivers energy efficiency and consistent performance.
With features like multi-sensors, dust filters, and turbo cool, it ensures clean air and rapid cooling. The 5-year comprehensive warranty adds peace of mind, though installation and service quality vary. Its ability to cool at high ambient temperatures makes it suitable for extreme climates.
What are buyers saying on Amazon?
Good cooling and adjustable settings, but installation and remote issues noted.
Why choose this product?
Choose this AC for its versatility, durability, and long warranty, making it ideal for those seeking flexibility and reliability in extreme climates.
What cooling capacity do I need for my room size?
For small rooms (up to 110 sq. ft.), opt for 1 Ton ACs like the Carrier 1 Ton or Hitachi 1 Ton . Medium-sized rooms (111–150 sq. ft.) require 1.5 Ton models like the Voltas 1.5 Ton or Lloyd 1.5 Ton , ensuring efficient cooling without overloading energy consumption.
How important is energy efficiency in choosing an AC?
Energy-efficient models like the Godrej 1.5 Ton (ISEER 4.1) or Lloyd 1 Ton 5 Star reduce electricity bills significantly. If you live in hot climates or use the AC frequently, prioritize higher ISEER ratings and star ratings (3-Star or 5-Star) for long-term savings.
Should I invest in smart features like Wi-Fi connectivity?
If convenience matters, go for smart-enabled ACs like the Carrier Wi-Fi AC series. Features like remote control via apps or voice assistants enhance usability but come at a premium. Evaluate if these features align with your lifestyle before investing.
How critical is warranty and durability for long-term use?
Long warranties, like the Godrej 5-Year Comprehensive or Blue Star 60-Month Warranty, ensure peace of mind. Durable copper condensers with anti-corrosion coatings are ideal for harsh climates, minimizing maintenance costs and ensuring uninterrupted performance.
Top 3 features of the best AC under ₹35000
Best AC under ₹35000
Tonnage
Energy Efficiency (Star Rating)
Special Feature
Voltas 1.5 Ton 3 Star Inverter Split AC
1.5 Ton
3 Star (ISEER 3.81)
4-in-1 Adjustable Cooling Modes, Anti-dust Filter, High Ambient Cooling (52°C)
Disclaimer: At Hindustan Times, we help you stay up-to-date with the latest trends and products. Hindustan Times has an affiliate partnership, so we may get a part of the revenue when you make a purchase. We shall not be liable for any claim under applicable laws, including but not limited to the Consumer Protection Act, 2019, with respect to the products. The products listed in this article are in no particular order of priority.
