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Pressure Conversions

Pressure is defined as force per unit area applied to an object in a direction perpendicular to the surface.

The table below presents conversion factors between common units of force.

Standard units = Pascal (P)

	atmosphere	inch of water	lb per sq in	lb per sq ft	cm of Hg	dyn/cm²	pascal
1 atm =	1	406.8	14.70	2116	75.99	1.013 * 10⁶	1.013 * 10⁵
1 in water =	2.458 * 10^-3	1	3.613 * 10^-2	5.202	0.1868	2491	249.1
1 lb/in²=	6.805 * 10^-2	27.68	1	144	5.171	6.895 * 10⁴	6.895 * 10³
1 lb/ft² =	4.725 * 10^-4	0.1922	6.944 * 10^-3	1	3.591x10^-2	478.8	47.88
1 cm Hg =	1.316 * 10^-2	5.353	0.1934	27.85	1	1.333 * 10⁴	1333
1 dyn/cm² =	9.869 * 10^-7	4.015 * 10^-4	1.450 * 10^-5	2.089 * 10^-3	7.501 * 10^-5	1	0.1
1 Pa =	9.869 * 10^-6	4.015 * 10^-3	1.450 * 10^-4	2.089 * 10^-2	7.501 * 10^-4	10	1

in of water @ 4º C	1 bar = 10⁶dyn/cm²
cm of Hg @ 0º C	1 atm = 29.92 in of Hg

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