Temperature is a measure of hotness or coldness expressed on any of numerous arbitrary scales that indicates the direction in which heat energy would naturally flow—that is, from a hotter (higher) body to a colder (lower) body (one at a lower temperature). Temperature is not the same as energy in a thermodynamic system; for example, a burning match has a significantly higher temperature than an iceberg, but the total heat energy in an iceberg is far greater than the energy in a match. Temperature, like pressure or density, is referred to as an intensive property—one that is unaffected by the amount of stuff being considered—as distinguished from extensive properties, such as mass or volume.