noun
pressure difference; pressure differential
Technical term used in physics and engineering to describe the difference in pressure between two points or regions.
この装置は圧力差を利用して動く。
This device operates using a pressure difference.
圧力差が大きいほど、流れは速くなる。
The greater the pressure differential, the faster the flow.
差 is a suffix meaning 'difference' or 'disparity', used in many compound nouns like 温度差 (temperature difference).
Compound of 圧力 (pressure) and 差 (difference).