Question

The temperature of the water is less than the temperature of its surroundings explain in terms of particles of the water why this is so

Answer 1

Answer:

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Explanation:

At the surface of the water, the more energetic molecules are escaping (evaporating). If the relative humidity is less than 100%, more are evaporating than are recondensing from the atmosphere. But that is taking heat energy from the water, so the temperature drops.

Answer 2

Explanation:

It’s about the process of convection, the transfer of heat to a moving fluid, speaking generally of both water and air as fluids. Whichever fluid is surrounding your skin, it picks up heat transferred from your body core, provided that its temperature is lower than your skin temperature (otherwise, it acts to warm you rather than cool you). Any movement of the fluid warmed by contact with your skin carries the heat away with it. Some movement is bound to happen either because you move relative to the surroundings, or because the fluid is moving (current, draft), or because the effect of the heat changes the density of the fluid so that it rises, to be replaced by cooler fluid, or a combination of these factors.

The difference is that water has much higher heat capacity than air. That means that it absorbs an equivalent amount of heat with a smaller increase in its temperature. It carries away the heat leaving your skin with only a tiny difference between the water temperature and the skin temperature — your skin temperature ends up being very close to that of the water. With air, a bigger temperature difference is associated with dissipation of the same amount of heat. Your skin temperature will end up a few degrees warmer than the air unless you are exposed to such a powerful blast of air that it becomes as effective as water as a heat transfer medium.

So the answer is — because your skin is colder when exposed to water rather than air at a given temperature.