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# Revision!

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TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. I have a great idea xD
Why don't we all revise physics together. Even though you might think its "ages" away, trust me it's not. Any question in physics you find hard post it and anyone can answer it. Similarly, the person who answers it also has to post a question. Lets try this and try to revise all the chapters in P1

P.S: Good luck everyone, for the physics exam and for any other exams you have! Hopefully, we will all ace this exam with As and A*s.
2. Explain convection currents.
3. (Original post by B3ASTy)
Explain convection currents.

Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection.Liquids and gases expand when they are heated. This is because the particles in liquids and gases move faster when they are heated than they do when they are cold. As a result, the particles take up more volume. This is because the gap between particles widens, while the particles themselves stay the same size.The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas. In this way, convection currents that transfer heat from place to place are set up.

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