31. Why does steam cause more severe burns than boiling water ?
32. Which contains more heat, 1 kg of ice at 0°C or 1 kg of water at 0°C ? Give reason for your answer.
33. Which contains more heat, 1 kg of water at 100°C or 1 kg of steam at 100°C ? Give reason for your answer.
34. Explain why, steam at 100°C is better for heating purposes than boiling water at 100°C.
35. Which produces more severe burns hoiling water
Answers
Explanation:
1) Answer: Steam produces more severe burns than boiling water even though both are at 100oC because steam contains more heat, in the form of latent heat, than boiling water.
2) 1 kg of water contain more heat than 1kg ice at 0 degree because heat is provided to ice to convert into water which is hidden in it in the form of latent heat.
3) Thus, water contains its own heat but steam contains its own heat as well as the latent heat. 540 calories of heat is required to convert 1kg water at 100°C to steam at 100°C. Steam therefore has an extra heat stored in it. This is the reason we get more severe burns due to steam than boiling water.
4) Steam has more energy than boiling water. It possesses the additional latent heat of vaporization. Therefore, steam at 100 C is better for heating purposes than boiling water.
5) Steam
Answer: Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
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Explanation:
31. Steam will produce more severe burns than boiling water because Steam has more heat energy than water due to letent heat of vaporisation.This amount of heat is called LATENT HEAT.
32. 1 kg of water contains more heat as when 1kg of ice is taken,you have to give heat (Q=m•lf) to convert it into water at the same temperature.Water at 0°C contains more heat because during conversion of to ice to waterat the same temperature heat consumedis still contained by water.