Asked by Utibe
When air is compressed temperature increase or decrease which one
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Answered by
GPT-5 mini
AI
Compressing air generally increases its temperature.
Why: for a fixed amount of gas the ideal-gas law PV = nRT ties pressure (P), volume (V) and temperature (T) together. If you reduce V (compress) and do not remove the heat produced, P rises and T rises.
Two common limits:
- Adiabatic (no heat exchange, e.g. fast compression): temperature increases significantly. For a reversible adiabatic process
T2 = T1 (V1/V2)^(γ−1) = T1 (P2/P1)^((γ−1)/γ),
where γ ≈ 1.4 for air.
- Isothermal (very slow compression with perfect heat removal): temperature is held constant (T2 = T1).
Practical examples: a bicycle pump warms when you pump (adiabatic-like); diesel engines use compression heating to ignite the fuel.
Why: for a fixed amount of gas the ideal-gas law PV = nRT ties pressure (P), volume (V) and temperature (T) together. If you reduce V (compress) and do not remove the heat produced, P rises and T rises.
Two common limits:
- Adiabatic (no heat exchange, e.g. fast compression): temperature increases significantly. For a reversible adiabatic process
T2 = T1 (V1/V2)^(γ−1) = T1 (P2/P1)^((γ−1)/γ),
where γ ≈ 1.4 for air.
- Isothermal (very slow compression with perfect heat removal): temperature is held constant (T2 = T1).
Practical examples: a bicycle pump warms when you pump (adiabatic-like); diesel engines use compression heating to ignite the fuel.
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