ICSE Class 7 Answered
How does ice melts at 0°C and steam turns into liquid at 100°C. Please explain because both for the melting of ice high temperature is required but 0°C is a low temperature. Same with the condensation point of steam; it requires a low temperature but 100°C is high temperature. Please explain.
Asked by sumantjha01.7spicertl | 19 May, 2020, 11:19: PM
Expert Answer
The process of change from one state to another at a constant temperature is called the change of phase. It is brought about by the exchange of heat.
The change from solid to liquid phase is known as melting, while the reverse change from liquid to solid is called freezing.
The change from liquid to vapour is known as vaporisation, while the reverse change from gas (or vapour) to liquid is called condensation (or liquefaction).
The direct change from solid to vapour is called sublimation and the reverse change from vapour to solid is called solidification.
The melting point and the freezing point are usually the same temperature. The melting point is the temperature at which a solid turns into a liquid, while the freezing point is the temperature at which a liquid turns into a solid. The transition of matter is same. For water, it is 0 degrees Celsius. When a block of ice is heated above 0 degrees Celsius, it melts, while a glass of water is cooled below 0 degrees Celsius it freezes.
Answered by Ramandeep | 20 May, 2020, 06:08: PM
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