Q:

# How much does a liter weigh?

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A liter is the metric unit of volume, not of mass or weight. The weight of a substance occupying 1 liter depends entirely on its density. For example, water has a density of approximately 1 gram per milliliter; hence, 1 liter of water weighs about 1 kilogram, or 2.2 lbs.

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Metals are generally far more dense than water. Gold has a density of 19.3 grams per milliliter (or cubic centimeter), according to Elmhurst College. One liter of gold contains 19,300 grams (or 19.3 kilograms) of this element. Consequently, a liter of gold weighs almost 20 times more than a liter of water.

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## Related Questions

• A:

As grams are a unit of mass and milliliters are a unit of volume, you need to know the density of the substance you are measuring in milliliters in order to convert the measurement from milliliters to grams. In the case of water, 1 gram = 1 milliliter, so 15 milliliters of water = 15 grams.

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• A:

Chemists use the mole unit because, in chemistry, it is often important to speak in terms of number of atoms or molecules rather than in terms of mass or volume. However, it is difficult and inconvenient to directly speak in absolute number of atoms. The mole also provides an easy base from which to convert to units of mass and back again.

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• A:

Because the milliliter is a unit of volume, and grams are a unit of mass, the answer to this question depends on what material one is measuring. For one of the most common materials, water, the conversion is simple. Because 1 milliliter of water equals 1 gram of mass, 300 milliliters of water weighs 300 grams.