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ubstance that is uniquely prevalent on Earth and is required for a multitude of physical and biological processes. Water has a sticky quality du
of water molecules associated with it. However, water has some other unusual qualities as well. For example:
1. The solid form is less dense than the liquid form and thus floats in the liquid form.
2. It exists in a liquid form at most surface temperatures and pressures on Earth.
3. The stickiness of water gives it a strong surface tension, as well as capillarity (water can actually defy gravity and move upward in plant roots and
While water primarily exists in liquid form on Earth, it undergoes phase changes as it passes through the hydrologic cycle. These phase changes requi
the hydrogen bonds and allow the phase changes to occur. The amount of latent heat required for each phase change is outlined in Figure 7.1.
When water exists in vapor form, we call it water vapor. Water vapor is measured in the Earth's atmosphere through one of several measures of hum
quantified by its contribution to overall air pressure, or vapor pressure. As air becomes warmer, more water vapor is required to reach a balance between e
limit has been reached, the air is said to be saturated, and the corresponding vapor pressure is called the saturation vapor pressure. Figure 7.2 shows the
pressure and temperature. One of our most common measures of humidity, relative humidity, is the ratio of vapor pressure to saturation vapor press
saturated, and water droplets form in the air mass through condensation. Eventually, assuming that sufficient available cloud droplets exist, rain or other
which are important components of the hydrologic cycle (Fig. 7.3).
Heat addition
Heat addition
336 1/g
He at release
Heat release
Heat addition
Gas-Water vapor
2594 J/g
Heat release
Figure 7.1 The amount of heat added or removed to complete each of the six possible phase changes of water.
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a. 5 g of liquid water to ice: 1680 J b.15 g of ice to water vapor: 38910 J c.15g of ice to liquid water and then from... View the full answer

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