how many kg is there in a gallon?

2 answers

I will depend on the density of the material. What is the material?
kilogram is a unit of mass while gallon is a unit of volume. you can relate them by using density of a particular substance (density is mass per unit volume or d = m/V)
for example, if we consider water, which has a density of 1 g/mL or 1 kg/L, and recalling that 1 gallon is 3.79 L, we say that,
1 gallon OF WATER weighs 3.79 kg

hope this helps~ :)