How many cubic feet is 19 gallons of water?

is this a homework question? THe amount of water in a cubic foot does change a small amount with temperature, and ice is about 90% as dense as liquid water. That said, there are about 7.5 gallons of liquid in a cubic foot, so if you divided 19 by 7.5, there's your answer. If you need a very precise answer, like at 43 degrees F how many cubic feet is it, as best it can be calculated, you would need to look in an engineering manual or web source for the density of water at 43 degrees F. Then you'd have some calculating to do.

depends. is the water in solid, liquid, or gaseous form?

2.5399306

you would first need to specify is the water: ice, liquid or water vapour? is it salt water or fresh water?

Salt/fresh water makes no difference. A gallon is a gallon, whether or not it's 100% pure H20 or not. On that note, matter state makes no difference as well. It's still the same volume no matter what it is. The question is really just asking you to convert 19 gallons to cubic feet! For the question, I can think of an extreemly complicated way to do it, but it's completely unreasonable.