As temperature rise the density become lower,When temperature goes down, density is higher but in higher temperature the body become bigger so why density become lower?
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You just said it! As the body is heated, it becomes bigger, so if it's mass doesn't change, it's density has decreased, since density is the mass divided by the volume. Density is an intensive property. It is not dependent upon the amount of material inside the system (scale invariant). A block of iron at a given temperature has the same density, regardless of how big or small the block is. |
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For the density of something to reduce one of two things must happen.
Case 1 effectively isn't happening (you do get some evaporation but not enough to affect the density), so case 2 happens. This is because for most materials as the temperature rises the atoms/molecules that make up the material move faster and further thus increasing the volume that the material takes up. There are exceptions to this - water being one in the range 0 to 3.8 °C - where the volume decreases as the temperature increases. |
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density is inversely proportional to volume of the body from the eqation: density = m/v With increase in size of body with temperature, volume of body also increases hence, the density will reduce (as it is inversely related to volume) hope you understood the answer. regards |
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