correct the following statement 1)Meniscus is formed in case of confined liquids due to the force of surface tension. 2) The process by which a gas changes to liquid state at some fixed temperature with the release of heat energy is called condensation. 3) Different liquids exerted the same pressure at a given depth.
Answer the following
1) During the change of state, temperature does not rise or fall.What happens to the heat energy supplied or given out?? Explain
2) Why does density vary from one substance to another substance?
3) Why is hearing affected while going up or coming down from the hills?
4) The SI unit of work or energy is joule.Explain why the work and energy have same SI unit.
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1. heat energy is lost as stated in the second law of thermodynamics
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