Difference between revisions of "Mass"
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==Units of Measure== | ==Units of Measure== | ||
*The [[SI]] unit for mass is the [[gram]]. | *The [[SI]] unit for mass is the [[gram]]. | ||
| − | *The [[imperial system]] has no measure for mass, as at the time it was popularized, the distinction between mass and weight had not been popularized. | + | *Larger units include the kilogram (1000 grams), tonne (1000 kilograms), kilotonne (1000 tonnes), megatonne (1000 kilotonnes), etc. |
| + | *The [[imperial system]] has no measure for mass, as at the time it was popularized, the distinction between mass and weight had not been popularized. | ||
==Related Formulae== | ==Related Formulae== | ||
Latest revision as of 21:44, 10 October 2013
Mass is, informally, the amount of material in an object. It is one of the core concepts of physics, especially mechanics.
Formal Definition
Mass is a measure of the amount of matter a physical body contains. Mass is often confused with weight, but is not the same. While weight is a measure of the gravity on a body, mass is the amount of matter. Note that in a standard gravitational field, mass is directly proportional to weight.
Units of Measure
- The SI unit for mass is the gram.
- Larger units include the kilogram (1000 grams), tonne (1000 kilograms), kilotonne (1000 tonnes), megatonne (1000 kilotonnes), etc.
- The imperial system has no measure for mass, as at the time it was popularized, the distinction between mass and weight had not been popularized.
Related Formulae
- Momentum is calculated by
, where 
is momentum, 
is mass, and 
is velocity. - Thermal energy is calculated by
, where 
is the thermal energy, is mass, and 
is heat.
, where 
is momentum, 
is mass, and 
is 
, where 
is the thermal energy, 
is heat.
