How many ml in 1 gr?

Answer 1

There are 1 ml in 1 gr.

NO.

The question, as stated, cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A gram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.

As a simple mental exercise consider a ml of air and of water. They will have very different masses.