Strictly speaking, Kg is a "kelvin gram". Kilogram (kg) is especially handy, because it's practically same as 1 liter of water, which is 10 cm^3. It's indeed

Strictly speaking, Kg is a "kelvin gram". Kilogram (kg) is especially handy, because it's practically same as 1 liter of water, which is 10 cm^3. It's indeed rather difficult to calculate duration of time. Quick, how many minutes between 6h:37m and 19h:12m? Angles are simple if you just use radians.