How many grams is 300ml?

Milliliters (ml) and grams (g) are two different units of measurement. Milliliters measure volume, while grams measure mass or weight. So there isn't a direct conversion between milliliters and grams.

The mass or weight of an object depends on its density, which can vary widely between different substances. For example, 300ml of water weighs 300 grams because the density of water is 1 gram per milliliter. But 300ml of a metal like iron would weigh much more than 300 grams because the density of iron is much higher.

To determine the weight or mass of a specific substance in grams, you need to know its density and use the following formula:

Mass (grams) = Volume (milliliters) x Density (grams per milliliter)

So, to find the mass of 300ml of a specific substance, you would need to know its density. Without knowing the density, we can't directly determine the weight or mass of a substance in grams based solely on its volume in milliliters.