Volume
volume explained  heart and river flow
Volume explained
Volume is measured in cubic metres (m^{3}) or
variations on it using prefixes.
The litre
(L) is often used to measure volume. A litre is simply a special
name for a cubic decimetre.
1 L = 1 dm^{3}
Hence 1 L ≡ 0.001 m^{3} (exactly). A cubic centimeter,
abbreviated as cc, is used to describe the size of car engines.
A cc is exactly the same thing as a mL.
1 mL = 1 cm^{3} = 1 cc
At room temperature at sea level one litre weighs 1 kg. So at
room temperature at sea level:
1 mL = 1 cm^{3} = 1 cc = 1 g
1 L = 1 dm^{3} = 1 kg
1,000 L = 1 m^{3} = 1,000 kg (1 tonne)
Note that the symbol for a litre is a capital L, although a lower
case l is sometimes used. 

Calculating Volume
Volume of a cube:
length x width x height
Volume of a prism:
Work out which dimension the prism has been extruded through,
then:
area of face x length
Volume of a sphere:
^{4}/_{3}·π·r^{3}

Random facts – heart and river flow
The average adult has about 5 L of blood. The human heart pumps roughly 5 L/min, but the actual amount can vary from 4½ to 6½ L/min under ordinary conditions. The maximum cardiac output for normal people is in the range 1420 L/min, but the heart of an Olympic athlete can pump up to 40 L/min.
The flow of the Amazon River accounts for 20% of the total flow of all the world's rivers, at about 6,600 km^{3} per year. That's roughly 12.5 billion L/min. That's the equivalent of the cardiac output of one third of the world's population.
