First and second laws of thermodynamics | Thermochemistry | High school chemistry | Khan Academy

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The first law of thermodynamics states that if a system gains/loses some amount of energy, the surroundings must lose/gain the same amount of energy. The second law of thermodynamics states that entropy does not spontaneously decrease. Entropy is a measure of how spread out energy is. As an example, if two systems at different temperatures are in contact, heat will flow from the warmer system to the cooler system until they reach thermal equilibrium (equal temperatures).
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[@punditgi]

Excellent video! 🎉😊

[@aapex1]

Well done, thanks!

[@inthedark726]

Thank u Sir Mahesh!💖

[@BigyanChap]

In the beginning of video, You asked "why doesn't it heat by itself instead of cooling?" Actually that does happen when you are in Qatar or Saudi Arabia. 😂

[@Aditya2364]

Lol😂

[@NovaNova-wc9bb]

ありがとう😊

[@abhayanand9585]

Just loved it! Keep it up making, you helped at lot earlier in my studies and now it's time to help more....

[@Aditya2364]

What is temperature? What is temperature of an electron?

[@user-dr3hq9eb1h]

Pleas sir can you explain why the entropy of the system can not spontaneously decrease? I like your explanation!!!🎉

[@pinkex6119]

cuz the amount of molecule reach equilibrium so it wouldn't randomly go back into the coffee.

[@blexaarron]

2NDLAW

[@RajaBabu-ur5kf]

Make video on Gibbs free energy too

[@Lokodovi]

so cute

[@sajucis]

Cryogenics may look suspicious

[@robminglana5186]

All the critics about pedagogy on khan academy when compared to professional teachers. LOL, students come here to watch videos on khan academy because the professional teachers themselves are arent doing their job well.