Question

When a red hot iron nail is dipped in cold water,the temperature of iron nail is decreased but the temperature of water is increased,Why?

Answer 1

A red hot iron nail is at a higher temperature than cold water. When the hot iron nail is dipped in cold water, heat from the nail flows into the cold water. Since heat from nail is transferred to water, temperature of water rises and temperature of nail falls.

Answer 2

When a red hot iron nail is dipped in cold water,the temperature of iron nail is decreased but the temperature of water is increased

• When the iron and water reach an equilibrium temperature of 100°C, the water won't continue to get hotter but will instead produce additional steam.
• High temperature to low temperature heat transfer. Since the iron and the water are both at the same temperature, there is no heat transfer here.
• The temperature of cold water is lower than that of a red-hot iron nail. Heat from the hot iron nail transfers to the cold water when it is dipped in the latter. Since heat from the nail is transferred to the water, the water's temperature increases while the nail's temperature decreases.
• Water and oxygen are necessary for the causes of corrosion. Carbonic acid, a weak acid, can be created when water and atmospheric carbon dioxide mix. This acidic solution encounters iron, where two reactions take place.
• An iron pan could potentially be harmed, although the likelihood of this happening is far lower. When you pour cold water into a heated pan, the temperature of the metal reduces locally (where the water hits the metal), and since metal expands with heat, cooling it down causes it to shrink.

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