Physical nature of Air

Hot air expands, and rises; cooled air contract – it s okay denser – and also sinks; and also the capability of the air to hold water depends on that is temperature. A provided volume that air in ~ 20°C (68°F) deserve to hold twice the amount of water vapor 보다 at 10°C (50°F). The partnership of just how much water a given mass that air in reality holds contrasted to the quantity it can hold is its loved one humidity.

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When air holds as much water vapor together it can for a provided temperature (100% relative humidity), the is said to be saturated. If saturated air is warmed, it can hold much more water (relative humidity drops), i m sorry is why heat air is supplied to dried objects--it absorbs moisture. On the various other hand, cooling saturation air (said come be at its dew point) pressures water the end (condensation). This is why a container the a cold beverage sweats: it cools the air beside it and also moisture indigenous the air condenses ~ above the outside of the can.

Air warmed by ocean currents picks up a the majority of moisture. As the heated air rises, it expands, i m sorry is measured at the surface ar as short air pressure. Widening air cools, which forces it to shed its moisture together rain or snow. The opposite is true for sinking air. Together air compresses and warms. In a zone that high pressure prefer this, moisture is took in by the wait from its surroundings.


This image represents the total precipitable water vapor for may 2009 together observed by's Atmospheric Infrared Sounder top top NASA's Aqua satellite. This image represents the total precipitable water vapor for might 2009 as observed by the Atmospheric Infrared Sounder (AIRS) ~ above NASA's Aqua satellite. It mirrors the total amount that water vapor existing in the atmospheric column over each point of Earth's surface. If all the water vapor in the column were compelled to loss as rain, the depth that the resulting pond on the surface at that suggest is equal to the value displayed on the map. Fifty millimeters is about 2 inches.

Physical nature of Water

Water is one enormously reliable heat-sink. Solar heat absorbed by bodies of water throughout the day, or in the summer, is released at night, or in winter. Sites on islands or coasts advantage from the moderating effect of the ocean and have "maritime" climates (like san Francisco). Sites far from the coastline lack this temperature buffering and also have too much "continental" climates (like Wichita).

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Like the heated wait in a hot-air balloon, boil water expands. Solar heat soaked up at the equator causes water to expand. Together heated water raises the regular level the the sea surface, and such adjusted ocean topography can be measured. The heat in the water is lugged to greater latitudes by ocean currents wherein it is released into the atmosphere. Water cool by cooler temperatures in ~ high latitudes contracts (thus it s okay denser), sinks, (lowers the neighborhood topography) and returns come the equator via the global ocean water circulation conveyor belt to finish the cycle.