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# CRITH

 A unit of mass, used for gases, equal to the mass of 1 liter of hydrogen at standard pressure and temperature; it is found experimentally to equal 8.9885 10 5 kilogram.

## Related Terms

### BRITISH THERMAL UNIT

(Btu) 1. A unit of heat energy equal to the heat needed to raise the temperature of 1 pound of air-free water from 60 to 61 F at a constant pressure of 1 standard atmosphere; it is found experimentally to be equal to 1054.5 joules. Also known as sixty degrees Fahrenheit British thermal unit (Btu60/61). 2. A unit of heat energy that is equal to 1/180 of the heat needed to raise 1 pound of air-free water from 32 F (0 C) to 212 F (100 C) at a constant pressure of 1 standard atmosphere; it is found experimentally to be equal to 1055.79 joules. Also known as mean British thermal unit (Btumean). 3. A unit of heat energy whose magnitude is such that 1 British thermal unit per pound equals 2326 joules per kilogram; it is equal to exactly 1055.05585262 joules. Also known as international table British thermal unit (BtuIT).

### MOLAR VOLUME

The volume occupied by one molecular mass in grams (g mole) under specific conditions. For an ideal gas at standard temperature and pressure it is 0.0224 m3/g mole.

### CENTIMETER OF MERCURY

A unit of pressure equal to the pressure that would support a column of mercury 1 centimeter high, having a density of 13.5951 grams per cubic centimeter, when the acceleration of gravity is equal to its standard value (980.665 centimeters per second per second); it is equal to 1333.22387415 pascals; it differs from the dekatorr by less than 1 part in 7,000,000. Abbreviated cmHg.

### MILLIMETER OF MERCURY

A unit of pressure, equal to the pressure exerted by a column of mercury 1 millimeter high with a density of 13.5951 grams per cubic centimeter under the standard acceleration of gravity; equal to 133.322387415 pascals; it differs from the torr at the bottom used for hauling bulk materials. mineral engineering See mining engineering.

### MICROGRAM

A unit of mass equal to onemillionth of a gram. Abbreviated g.

### QNH

A weather station's level pressure reduced to mean sea level by assuming the International Standard Atmosphere (ISA) conditions between the station and sea level.

### BULK DENSITY

The mass of powdered or granulated solid material per unit of volume.

### GAS-OIL-RATIO (GOR)

The gas volume flow rate, relative to the oil volume flow rate, both converted to volumes at standard pressure and temperature.

### DRAPER EFFECT

The increase in volume at constant pressure at the start of the reaction of hydrogen and chlorine to form hydrogen chloride; the volume increase is caused by an increase in temperature of the reactants, due to heat released in the reaction.

### COMPRESSIBILITY

Measure of ability of being compressed. The change in volume of a unit volume of a fluid when subjected to a unit change of pressure.

### Related questions

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