Isothermal compression or expansion more closely models real life when the compressor has a large heat exchanging surface , a small gas volume , or a long time scale -LRB- i.e. , a small power level -RRB- .

Isothermal compression or expansion is favored by a large heat exchanging surface , a small gas volume , or a long time scale -LRB- i.e. , a small power level -RRB- .
