does density change with temperature. why?

Answer 1

Most substance density changes with temperature. As density is the ratio of mass of substance to its volume. As mass is uneffected by temperature, then the only variable is volume, which is heavily temperature dependent. The variation of density with temperature is more pronounced for gases than solids, where in general the density decreases with increasing temperature. Solids and liquids volume increase with the coefficient of thermal expansion, whilst gases volumes are very temperture sensitive. The reason why is due to the kinetic theory of gases where molecules gain more (kinetic) energy they vibrate and move more and therefore occupy a larger voulme.

Answer 2

Im sorry to tell you wrong Ben C, but density DOES change with temperature. Density is the amount of matter in a given space. When matter heats up, it (almost always) expands. Thus, the density of the object is less, because there is the same amount of material in a larger space.
The coefficient of thermal expansion (a physical property all materials have) expresses the relationship between a matter's volume and temperature.
For easy example, lets say you have a basketball. It is a closed object, no air can come in or out (assuming you dont manually add more air with a pump). If you pumped it up when it was warm out, it would bounce. However, if you left the same ball outside when it was cold, when you went to play with it, it would be a bit deflated and not bounce as well. The same amount of air is taking up less volume, hence, has a smaller density.

Answer 3

While this sounds suspiciously like a homework question, the answer is no. You would know that density has to do with the amount of matter in a given space. If you increase the temperature, does that change?

Answer 4

What does change with temperature? Does mass? Does volume? If one of those changes with temperature then density will change with temperature since density is the relationship of mass to volume. Think about it.

Answer 5

rearrange the acceptable gas regulation: n/V = P / R x T the term n/V is density. in case you improve T and carry P consistent, the density will shrink. And it decreases by way of fact the final quantity V will improve. in case you strengthen the temperature and you're looking after the comparable quantity, the density won't replace however the tension (P) will improve. Density is a function of temperature at consistent tension.