CSCAPrep
Reviewed CSCA Physics question · Standard

一定质量的理想气体，在压强不变的情况下，温度从27°C升高到127°C。求体积变为原来的多少倍。

  1. 4/3
  2. 3/4
  3. 100/27
  4. 127/27
Show the answer and explanation

Correct answer

A. 4/3

Principle or equation

盖-吕萨克定律：一定质量的理想气体，在压强不变时，体积与热力学温度成正比，即 V1/T1 = V2/T2。

Why this answer is correct

热力学温度 T1 = 27 + 273 = 300 K，T2 = 127 + 273 = 400 K。由 V1/T1 = V2/T2，得 V2/V1 = T2/T1 = 400/300 = 4/3。

Example

若温度从27°C升高到327°C，则体积变为原来的600/300=2倍。

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