Hello,
I am always using metric system (normal, I am in Europe) and a good advantage of the metric system is the easy path from one unit to another.
water (pure at 1 atmosphere pression) is a big reference in the system.
it freeze at 0° and boil at 100° Celsius
1 liter of water weight 1 kilo gramme (kilo meaning x1000)
1 gramme of water goes into a cube of 1 centimeter by 1 centimeter by 1 centimeter
So, with some very easy "facts", I just linked volume with weight with distance unit and with the same base, I explained the temperature.
Sometime, understanding the origin of a unit helps to memorize and work with it.