Water can absorb or release a huge amount of heat without a change in temperature because of its high specific heat. This ability of water makes it act as a 'temperature bank' in the ecosystem, because during hot seasons water is able to absorb and store a large amount of heat, and when it gets colder, the heat is gradually released, enabling the moderation of temperatures, especially around coastal cities.
The specific heat of a substance is the amount of heat that 1 gram of that substance must absorb or lose for it to change its temperature by 1 degree Celsius. Compared to other substances, water has a relatively high specific heat capacity. This is due to the presence of hydrogen bonds as energy is required to break or form hydrogen bonds.
Hydrogen bonds also give water its high heat of vaporisation. The high specific heat and heat of vaporisation of water helps to moderate Earth's climate and stabilize ocean temperatures.
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