Page 118 - Chemistry - XI
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Common Units of Force* and Pressure Temperature
1 atmosphere = 760 millimetres of mercury SI Base Unit: Kelvin (K)
= 1.013 × 10 pascals K = -273.15°C
5
= 14.70 pounds per square inch K = °C + 273.15
1 bar = 10 pascals °F = 1.8 (°C) + 32
5
1 torr = 1 millimetre of mercury °F 32−
°C =
1 pascal = 1 kg/ms = 1 N/m 2 1.8
2
* Force: 1 newton (N) = 1 kg m/s , i.e. the force that, when applied for 1 second gives a 1-kilogram mass
2
a velocity of 1 metre per second.
** The amount of heat required to raise the temperature of one gram of water from 14.5°C to 15.5°C.
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