Dolphin 發問時間： 社會與文化語言 · 1 0 年前

# 請問有關冰被熔化的過程之問題?

the heating of ice 之斜率較大

If the heating of ice had the greater slope, does this fit with what you know about the specific heat of ice and the specific heat of water?

Specific heat 指的是比熱 not (某種特定的熱)

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• s_t_65
Lv 4
1 0 年前
最佳解答

The specific heat of water is 1 cal / g K by definition. That of ice is .51 and of water vapor is .48 (at constant pressure). Ice and water vapor (steam) are alternate phases of water. The specific heat of human tissue is .85. That of air is .23.

For a given substance at a given pressure, phase changes occur at well-defined temperatures. For water at standard atmospheric pressure (at the surface of the earth), those are 273.15K and 373.15K (0 C and 100C, the freezing and boiling points, which define the Celsius degree, and therefore the Kelvin). For a given substance, the heat change per unit mass required for a phase transition is called the latent heat (of either fusion or vaporization) L. This means that

DQ = m L.

The latent heat of fusion (freezing) of water is 80 cal / g, and the latent heat of vaporization of water is 540 cal / g at 100 C. Note that the heat added or lost during a phase change does not affect the temperature during the phase change. Icewater is at 0 C until all of the water has frozen; when melting, it is at 0 C until all of the ice has melted. Likewise, water is at 100 C until all the water has boiled away; if the water / steam system is in a closed environment, the steam is at 100 C until the water has all evaporated.

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