Do people use Imperial (UK) gallon or U.S gallon in measuring the volume of aquariums?

Most aquarium literature will give tank sizes in U.S. gallons or in liters (or both).

1 U.S. gallon = 3.785 411 784 liters

For rough-and-ready calculations, you can figure 3.8 liters to the U.S. gallon.

However, some aquarium literature published in the UK might use Imperial gallons.

Imperial (British or UK) gallons are bigger than U.S. gallons (I don't know why they are different, but they are).

1 U.S. gallon = 0.832 674 184 63 U.K. gallon

1 U.K. gallon = 1.200 949 925 5 U.S. gallons

1 U.K. gallon = 4.546 09 liters

To make things even more complicated, there's also something in U.S. measures called a "dry gallon." A dry gallon is more than a liquid gallon (1 U.S. dry gallon = 1.163 647 193 8 U.S. liquid gallon). You have to wonder what nut devised this system.

However, any reference you see in aquarium articles to "gallons" will be to liquid gallons. I've never seen dry gallons used in anything having to do with aquaria or fishkeeping.

Here's a handy converter for all these measures:

http://www.onlineconversion.com/volume.htm

I am in the UK and use Imperial UK gallons people in the US Canada etc would Use US gallons europe use UK imperial gallons .

depends on where in the world you are. America still uses the s.a.e. Forms of measurement, while most of the other world uses metric.

because of the fact they use the Metric gadget of length and we use the first gadget of length. merely like the way they use Kilometers consistent with Hour rather of Mile consistent with hour and a million mile equals a million.609344 kilometers

Depends on where the tank in question was made.

That would depend on where these hypothetical people are located.

depends on where you live, ie. UK or US