pressure units conversion

Please see the attached file.

what is the formula for converting atm to Torr?
example: 1.87 atm to Torr
1 atm = 760 Torr,
So 1.87 atm = 1.87 * 760 Torr = 1421.2 Torr

Also what is the formula for converting Torr to mmhg?
example: 748 Torr to mmHg
Torr and mmHg are the same unit. So 1 Torr = 1 mmHg.
748 Torr = 748 mmHg.

What about mb to kPa?
example: 998mb to kPa
1 bar = 100,000 Pa
1 mb (millibar) = 0.001 bar = 100 Pa = 0.1 kPa
So 998 mb = 998 × 0.1 kPa = 99.8 kPa

then in. Hg to atm
example:26,88 in Hg to atm

1 inch = 25.4 mm, so 1 in Hg = 25.4 mmHg.
We also know that 1mmHg = 1.3158×10−3 atm
Therefore, 1 in Hg = 25.4 ×1.3158×10−3 = 3.342 ×10−2 atm.
Then 26.88 in Hg = 26.88 × 3.342 ×10−2 = 0.898 atm.

See the attached table for pressure units conversion.
Pressure Units

Pascal
(Pa)
Bar
(bar) Technical atmosphere
(at)
Atmosphere
(atm)
Torr
(mmHg) Pound-force per
square inch
(psi)
1 Pa ≡ 1 N/m²
10−5 10.197×10−6 9.8692×10−6 7.5006×10−3 145.04×10−6
1 bar 100 000 ≡ 106 dyn/cm²
1.0197 0.98692 750.06 14.504
1 at 98 066.5 0.980665 ≡ 1 kgf/cm²
0.96784 735.56 14.223
1 atm 101 325 1.01325 1.0332 ≡ 1 atm
760 14.696
1 torr 133.322 1.3332×10−3 1.3595×10−3 1.3158×10−3 ≡ 1 mmHg
19.337×10−3
1 psi 6 894.76 68.948×10−3 70.307×10−3 68.046×10−3 51.715 ≡ 1 lbf/in²

Example reading: 1 Pa = 1 N/m² = 10−5 bar = 10.197×10−6 at = 9.8692×10−6 atm ....etc.

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