Produced artificially, it is a colorless, volatile, pungent liquid at standard temperature and pressure.
The first few members of the series are volatile liquids; methyl nitrite and ethyl nitrite are gaseous at room temperature and pressure.
For example, schools in New South Wales, Australia use 25 °C at 100 kPa for standard laboratory conditions.
The standard enthalpy of combustion is the enthalpy change when one mole of a reactant completely burns in excess oxygen under standard thermodynamic conditions (although experimental values are usually obtained under different conditions and subsequently adjusted).
Standard conditions for temperature and pressure (more commonly abbreviated STP), a set of environmental parameters
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