# How To Convert 250 Cubic Meter To Tonne?

You cannot simply convert cubic meters into tonnes. You need to know what the substance you are measuring is, as cubic meters is a measure of volume, not mass. To find out the mass of a given volume of a substance, you need to know its density.
The density of certain substances are listed as follows:
• The density of liquid water is approximately 1000 kg/cubic meter.
• The density of gaseous air is 1.22521 kg/cubic meter.
• The density of ice (solid water) is approximately 910 kg/cubic meter.
• Finding the Weight of the Substance in the Question
This means multiplying the density of the substance (how much stuff of a substance is in a given space - measured in kg/liter) by the volume, of which you know already at 250 cubic meters. Some densities of basic substances are listed above, but if your density is more specific, it won't be hard to find. This then gives you the mass of 250 cubic meters of the substance in kilograms.

• Turning This Value into Tonnes
Once you have the mass of 250 cubic meters of the substance, simply divide this value by 1000 to get the number of tonnes.

The same formula will work with any kind of substance, whether liquid or solid. However, there is a vast difference between the volume of a substance, and the mass of that volume. To be sure of the mass of something if it is gaseous or liquid, you need to know the density of the substance that is being converted, in order to get its mass. Without the density, you will not be able to know how much mass is in the volume you are working with.
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250 Cubic Meters is a Volume, not a mass (weight)

you need the density of the block volume, however lets say it is a rock with
a density of 2.7 (metric) tonnes per cubic meter, then the answer would be
250 cubic meters x 2.7 tonnes/cubic meter = 675 tonnes

if this same volume was water, the calculation would be
250 cubic meters x 1.0 tonnes/cubic meter = 250 tonnes

if this volume was Air, the calculation would be
250 cubic meters x 0.00119 = 0.2975 tonnes
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