How do you Convert the mtr to Gram?

Answer 1

you can't.

metre is length or distance, gram is mass (weight)

Answer 2

To convert meters (m) to grams (g), you would need to know the density of the substance you are measuring. Density is typically expressed in grams per cubic centimeter (g/cm^3) or grams per milliliter (g/mL). Once you have the density, you can multiply the volume in meters by the density to get the mass in grams.