Question

How much does the water in a 55 gallon aquarium weight in pound? 25°c, the density of water is 0.997 g/cm^2 ?

Answer 1

Got me....I suppose you are using a `"US gallon"`? I make it about `46*"libs"`,,,

Explanation:

And my question illustrates the importance of consistency in units. `1*"US gallon"=3.785*L`....

And so we got a volume of...

`55*"US gallon"xx3.785*L*"gallon"^-1xx1*kg*L^-1=208.175*L`

And this represents a mass of ....

`208.175*Lxx1*kg*L^-1=208.175*kg`

And in non-Christian units this is a mass of `(208.175*kgxx1000*g*kg^-1)/(453.5923*g*lb^-1)=??*lb`

Just to add that a `"UK gallon"`, i.e. a proper gallon in which there are EIGHT pints, has a volume of `4.546*L`...it is a bank holiday today in Blighty, and when I order my pint at the pub its volume will be MANDATED to be `568.2*mL`...