How is a pascal related to a newton per square metre?
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The pascal (Pa) is the International System of Units (SI) unit for pressure and stress. It is defined as exactly one newton per square metre.12
In the context of a gas, pressure is the perpendicular force exerted per unit area, resulting from the bombardment of container walls by gas molecules. Because one pascal is a relatively small unit, kilopascals (kPa)—representing 1,000 newtons per square metre—are frequently used for practical measurements, such as atmospheric pressure.21