( FROM GREEK HELIOS, SUN ).IT IS THE LIGHTEST OF THE INERT GASES (DENSITY 0,138) AND NONFLAMMABLE, DISCOVERED IN SOLAR ATMOSPHERE AND WHOM EXISTS IN VERY SMALL QUANTITY IN AIR, USED TO BLOW UP THE BALLOONS AND THE AEROSTATS, AND, AS A LIQUID, IN CRYOGENICS; ELEMENT (He), ATOMIC NUMBER 2, MOLECULAR WEIGHT 4,0026. IT ’S POSSIBLE TO FIND IT INTO OIL LAYER , LIKE IN AMERICA, AND IN ALGERIA (…)

To recap on the gases and notably on l ’Hélium 4 (4He), Information took in l ’Encyclopédie des gaz - L’AIR LIQUIDE

Perfect gas:

For a perfect gas, the relation f ( P , V , T) = 0 takes a relatively simple form:

P . V = n . R . T P V T R PASCAL M3 K 8,3143 atm cm3 K 82, 056 Bar dm3 K 83,143 Mm Hg dm3 K 62,363

P =absolute pressure

V =volume occupied by the gas ( volume is sometimes called water capacity in industrial practice )

n =number of moles contained in volume V

R =perfect gaz molar constanteis defferent values for a different units of pressure and volume

T =absolute temperature expressed in K ( T (K) = t (°C) + 273,15°)

NEXT Helium INDEX RETURN MOTOR