Simple Science: Making a Cup Levitate with Fire!

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All you need is a matchbox, a small candle, a light plastic cup, and thread to create this incredible physics demonstration! 🔥
This setup shows how heat transfer by convection works: the candle flame heats the air inside the cup, making it less dense than the surrounding cooler air. This difference in density creates buoyancy, causing the cup to rise and float.
Science doesn't have to be complicated! Always ensure a responsible adult is present when working with fire.
Setup: The cup is lightly suspended over the flame by threads attached to the candle/matchbox base.

India has taken a major leap in hypersonic technology.

On 9 January 2026, DRDO’s Hyderabad-based DRDL laboratory successfully conducted a long-duration ground test of a hypersonic scramjet engine for more than 12 minutes.

A scramjet (Supersonic Combustion Ramjet) is an air-breathing propulsion system that uses oxygen from the atmosphere and operates at speeds above Mach 5, which is more than five times the speed of sound.

This achievement builds on India’s earlier success in the HSTDV mission, where a Mach 6 hypersonic flight was demonstrated. It is considered a critical step toward future hypersonic missile and space-access technologies.

What are your thoughts on India’s hypersonic progress?
Share your views in the comments.

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Jai Hind 🇮🇳

#Hypersonic #Scramjet #DRDO #IndiaDefence #Mach5 #HSTDV #IndianTechnology #nitishkraut