| Term | Definition |
|---|
| boyle's law | temperature remaining constant, the volume of a given mass of dry gas is inversely proportional to its pressure |
| charles law | pressure remaining constant, the volume of a given mass of dry gas is directly proportional to the absolute temperature |
| gas equation | an equation of simultaneous effect of the changes of temperature and pressure on the volume of a given mass of gas |
| gay lussacs law | when gases react, they do so in volumes which bear a simple whole number ratio to one another and to the products formed if gaseous, provided the volumes are measured under same conditions of temperature and pressure |
| avogadro's law | under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules |
| absolute zero | the temperature at which the volume of a gas would theoretically be reduced to zero and which gives the lowest possible temperature that can be reached |
| standard temperature and pressure | a temperature of 0*C and a pressure of 760 mm of Hg |
| atomicity | the number of atoms present in one molecule of an element |
| vapour density | the ratio of the mass of a certain volume of a gas to the mass of the same volume of hydrogen under the same conditions of temperature and pressure |
| gram molecular weight | the weight of a substance equal to its molecular weight |
| gram atomic weight | the atomic weight of an element |
| mole | the amount of the substance that contains the same number of units as the number of atoms in 12 grams of carbon C12 isotope |
| avogadro's number | the number of elementary units contained in a mole of a substance |
| molar volume | volume occupied by one gram molecular weight of a gas at STP |
| hydrogen scale(atom) | the number which represents how many times an atom of an element is heavier than one atom of hydrogen whose wight is taken as unity |
| carbon scale(atom) | the number which represents how many times an atom of that element is heavier than one twelfth of an atom of carbon C12 isotope |
| hydrogen scale(molecule) | the number which represents how many times a molecule of a substance is heavier than one atom of hydrogen whose weight is taken as unity |
| carbon scale(molecule) | the number which represents how many times an molecule of that substance is heavier than one twelfth of an atom of carbon C12 isotope |
| empirical formula | the simplest formula of a compound which gives the simple whole number ratio of the various elements present in one molecule of the compound |
| molecular formula | a chemical formula which which gives the exact number of atoms of the elements in one molecule of a compound |
| gram molecule | the weight of a substance equal to its molecular weight |
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