The total amount of fresh water on earth is [tex]3.73 *10^{8} km^3[/tex]
Hence the volume of water [tex]v= 3.73*10^{8} km^{3}[/tex]
we are asked to convert this into cubic metre and cubic feet.
we know that 1 km = 1000 m.
[tex]1 km^3 = [10^3 m]^3[/tex]
[tex]1 km^3 = 10^{9} m^{3}[/tex]
we have been given [tex]v = 3.73 *10^{8} km^3[/tex]
[tex]v = 3.73 *10^{8} *10^{9} m^{3}[/tex]
[tex]v = 3.73*10^{17} m^{3}[/tex] [ANS]
Now we have to convert it into cubic feet
we know that one metre = 3.28083 feet
[tex]1 m^{3} =[3.28083feet]^{3}[/tex]
[tex]1 m^{3} =35.3143472 feet^{3}[/tex]
Hence [tex]v =3.73*10^{17} m^{3}[/tex]
[tex]= 3.73*10^{17} *35.3143472 feet^{3}[/tex]
⇒ [tex]v = 131.7225*10^{17} feet^{3}[/tex] [ANS]