How may kg in 1 cubic meter?

Answer 1

A kg is a measure of mass, a cubic meter is a measure of volume, so without a way to convert from one to the other (in this case a mass density), the question has no meaning. If you were considering something with a density of about 1 gram per cm, like water, then the answer would be 1000 kg (a metric tonne), but if the substance were 5 grams per cm, like rock, then the answer would be 5000 kg