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Description
Flashcards by Alvaro Vargas Calero, updated more than 1 year ago
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Created by Alvaro Vargas Calero
almost 4 years ago
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| Question | Answer |
| Density | The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: D = m/v |
| The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. | |
| Common units | kilogram per cubic metre (kg/m3) The litre and metric tons are not part of the SI, but are acceptable for use with it, leading to the following units: kilogram per litre (kg/L) gram per millilitre (g/mL) metric ton per cubic metre (t/m3) |
| Densities using the following metric units all have exactly the same numerical value, one thousandth of the value in (kg/m3). Liquid water has a density of about 1 kg/dm3, making any of these SI units numerically convenient to use as most solids and liquids have densities between 0.1 and 20 kg/dm3. | kilogram per cubic decimetre (kg/dm3) gram per cubic centimetre (g/cm3) 1 g/cm3 = 1000 kg/m3 megagram (metric ton) per cubic metre (Mg/m3) |
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