Q:

What happens to density as temperature increases?

A:

In general, matter expands with rising temperature, which leads to a fall in density. However, there are important exceptions, such as the case with water when it transforms from the solid to the liquid state. Its molecules contract, leading to both a fall in density and a rise in density.

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The ideal gas law, PV = nRT, shows that for gases, volume increases with an increase in temperature, which means that density falls. "P" is pressure, "V" is volume, "n" is number of moles and "R" is a constant. The equation shows that if number of moles and pressure are kept constant, an increase in temperature leads to an increase in volume. On the other hand, the equation "density = mass/volume" shows that for other matter, such as pure liquids and solids, density still tends to fall with increasing volume, as most matter expands with a rise in temperature anyway. This shows that, bar a few exceptional cases, density falls with an increase in temperature.

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Related Questions

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The density of dark Karo corn syrup is 1.37 grams per milliliter, while that of light Karo corn syrup is 1.33 grams per milliliter. Differences in density depend on the brand, type and grade of the corn syrup, which is rated by dextrose equivalence. Temperature and pressure also affect density.

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• A:

Density is defined as mass per unit volume, so it is necessary to measure both the weight and volume of an object to determine its density. Use a scale to measure the object's weight. A ruler can be used to measure the dimensions of an object and calculate its volume.

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The density of water increases as the temperature decreases, but only until approximately 4 degrees Celsius, where density starts to decrease at any point lower than that. When water freezes, turning into ice, it has a density lower than liquid water, which allows it to float. Ice cubes float on a glass of water like an iceberg floats on the ocean.