feet; abbreviation: ft; symbol: â² , the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
Avogadro's law (sometimes referred to as Avogadro's hypothesis or Avogadro's principle) is an experimental gas law relating volume of a gas to the amount of substance of gas present.[1] A modern statement of Avogadro's law is:
Try the following on your calculator to see what we mean: 1  Enter Avogadro's Number. 2  This number is about 6.022 x 10 23 and represents the number of things in a mole -- no, not the burrowing animal or that beauty mark on your friend -- but rather a unit of measurement you'll use often in chemistry.