It depends on how hot it is. For example, if it is heated to 160o F, it will never boil.
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If it's water, then it's 1 gr since water's density is 1 gr/ml. For anything else you need the density since grams are a weight metric while milliliter is a volume metric ... it would be like asking how many pounds in a gallon.
That would depend on the density of the material in question. For example, clean (no salt) Water ... approx 1000mg = 1ml depending on the temperatur of the water.
Exactly one.
120 ml.
1 gram of water = 1 milliliter of water, and 2.9 kilograms = 2900 grams, so 2.9 kilograms of water take up a volume of 2900 milliliters, or 2.9 liters.