How is hot water heavier than cold water?

Answer 1

If you have ever heard of the expression, "Hot air rises and cold air sinks." than the principle is the same. When you heat up water, the particles begin to move faster and farther apart causing the same volume of liquid to become lighter.

Answer 2

Hot water isn't heavier than cool water. In most substances the warmer is becomes the faster the molecules (or atoms) move and the less dense the substance becomes as it expands to occupy more volume with the same mass.

Water is unique in that as it cools from room temperature liquid water becomes increasingly dense, just like other substances. But at approximately 4 °C, water reaches its maximum density, thus in a pond the water at 4 °C will sink to the bottom with the cooler water above thus preventing a pond or lake from freezing solid. This unusual negative thermal expansion is attributed to strong, orientation-dependent, intermolecular interactions

Answer 3

It isn't. Though both hot and cold water are the same 'weight', hot water is less dense than cold water, as the molecules within it have more energy, and therefore move faster.

This can be shown by pouring coloured hot water gently into a bowl of cold water. The hot water will rise to the top, and the cold water will sink.

Answer 4

In cold water, the molecules are placed close to each other. As the temperature of water increases, the molecules move away from each other due to weakening of the Van der Waal's forces holding them together. Hence, cold water is denser than warm water.

Answer 5

It's not..Cold is more dense than warm because its molecules are closer together.

Answer 6

Because warm water is less dense than cold water.