Since temperature shows the average energy of the particles per unit volume, it would be unsurprisingly lower in high places. Another factor for the cold temperature of hill stations is the heating process on earth. The air does no directly gets heated up by the sun; instead, the sun heats the surface of the earth. When the surface gets heated up, it continues to heat the layer of air above it gradually. During this process, the air gets enough kinetic energy, which allows it to move and rise in the air to expand — it means it has a decrease in its density.
This movement of air means that while it is traveling upwards, the temperature continues to drop, which explains why higher places have cooler temperatures. What is a Hill Station? Why are Hill Stations Cooler? Our sun is about billion feet away from the surface of the Earth.
Pressley said that pressure and our sun also have a lot to do with weather. When sunlight travels through the atmosphere, it heats the surface of the planet.
When the surface gets warmer, it sends heat back up to air molecules near the surface and warms them up. The molecules of air rise. As they do, they expand and cool. There are many reasons. The hot air is lighter and it rises above leaving cold air below. Pressure decreases as altitude increases. Which means the wind flows from high to low pressure areas, that is from plains to hills.
The hot winds meeting low pressured hills expand at once and cool down. That could be one reason why hills are cooler. One easy understanding is 4 degree centigrade change occurs in meters altitude upwards. So it's only natural that room temperature is much lower in hills.
The reason of cold climate in hills than plains is because of the adiabatic nature of Earth's atmosphere. The Earth and its atmosphere can be treated to be an unusual body with only the sun as an extraneous cause of heat. Consequently, we notice that since the predominant feature is the confinement of the Sun's radiant heat when compared to the reflected ground heat as the altitude increases, returns atmospheric heat holding capacity to immediately fall off as you go from the plains to the hills.
Pictured is Mount Everest behind the mountain of Nuptse. Air pressure can best be described as the weight of the air molecules that press down on the Earth. The air pressure lowers as altitude increases. Therefore, the highest air pressure is at sea level where the density of the air molecules is the greatest. What is the normal atmospheric pressure? The standard or close-to-average atmospheric pressure at sea level is about However, the atmospheric pressure does not always equal this standard value due to changes in the weather.
What is considered high air pressure? A barometer reading of 30 inches Hg is considered normal air pressure.
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