gázmennyiség

Gázmennyiség, often abbreviated as GM, is a unit of measurement used to quantify the amount of gas in a sample. Unlike mass or volume, which can vary with temperature and pressure, gázmennyiség is a fundamental property of a gas, representing the number of gas particles.

The SI unit for gázmennyiség is the mole (mol), which is defined as exactly 6.02214076 × 10^23 elementary entities, such as atoms, molecules, or ions. One mole of any substance contains the same number of particles as one mole of any other substance.

Gázmennyiség is particularly useful in chemical reactions, where it is often used to express the stoichiometry of reactions. For example, in the reaction 2H2 + O2 → 2H2O, the gázmennyiség of hydrogen (H2) and oxygen (O2) is in a 2:1 ratio.

The relationship between gázmennyiség, volume, and temperature is described by the ideal gas law, which states that the product of pressure (P), volume (V), and temperature (T) is proportional to the number of moles (n) of gas, or PV = nRT, where R is the ideal gas constant.

Gázmennyiség is also used in the calculation of molar mass, which is the mass of one mole of a substance. The molar mass can be calculated by dividing the mass of a sample by its gázmennyiség, provided that the sample is pure.