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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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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