1) NTP - Normal Temperature and Pressure - is defined as 20oC (293.15 K, 68oF) and 1 atm ( 101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 30 in Hg, 760 torr)
2) STP - Standard Temperature and Pressure - is defined as 0oC (273.15 K, 32oF) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 30 in Hg, 760 torr)
Note that even if pounds per cubic foot is often used as a measure of density in the U.S., pounds are really a measure of force, not mass. Slugs are the correct measure of mass. You can divide pounds per cubic foot by 32.2 for a rough value in slugs.
Densities of solids, liquids and gases. Definitions and convertion calculators.
Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component.
Specific heat of Benzene Gas - C6H6 - at temperatures ranging 250 - 900 K.
Carbon - Nitrogen ratios for biogas produced from various raw materials.
Typical composition of biogas produced from household waste.
Potential biogas production from animal manure.
Chemical, physical and thermal properties of n-Butane.
Oxidizers vs. inert vs. flammable gases.
Densities of common products - Imperial and SI-units.
Online density converter with commonly used units.
Dangerous vs. tolerable concentration levels for some industrial gases.
Absolute (dynamic) viscosities of some common gases.
Flame and explosion limits for gases like propane, methane, butane, acetylene and more.
Molar specific heats for some common gases at constant volume.
Specific gravities of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases.
Chemical, Physical and Thermal Properties of Helium - He.
Specific heat of Hydrogen Gas - H2 - at temperatures ranging 175 - 6000 K.
Chemical, Physical and Thermal Properties of Hydrogen - H2.
Boiling temperatures for common liquids and gases - acetone, butane, propane and more.
Mass vs. weight - the Gravity Force.
Chemical, Physical and Thermal Properties of Methane - CH4. Phase diagram included.
Definition and molecular weight (molar mass) of some common substances.
Natural gas consumption for equipment like boiling pans, ovens, cookers, kettles and more.
Specific heat of Nitrogen Gas - N2 - at temperatures ranging 175 - 6000 K
Capacity of natural gas orifices.
Chemical, Physical and Thermal Properties of Oxygen - O2.
The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure.
Density, specific heat, thermal conductivity and more.
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