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  • Category: Science

    Why hills are cooler than plains?

    Interested in knowing the scientific reasons about why hills are cooler than plains? Looking out for the reasons online? Check out this page for responses from experts.

    During summer people run to hill stations and other high altitude destinations to escape from the hot weather in plains below.

    From a layman's point of view hills are more near to sun then that of plains. Still, we do not feel the heat of the sun there as we are having in plains below.

    I am asking this question to get scientific explanations. Why it is cooler on hills than plains?
  • Answers

    5 Answers found.
  • The water from the earth and oceans will get evaporated slowly due to the heat from the Sun. These water vapours will have a tendency of travelling upwards as they are lighter than air. The air always will contain moisture in it. The percentage of moisture will increase as it goes upwards. So when you climb up to a hill the moisture content will be high and as the saturation level comes faster, the rains will be more there.
    Because of this higher percentage of moisture in the air, the breeze will be cool and you will feel the coldness better.

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  • 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 500 meters altitude upwards. So it's only natural that room temperature is much lower in hills.

    The stronger a light shines the darker are the shadows around it.

  • 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. Due to gravity, Earth's atmosphere clings to its surface with the air pressure increasing as you get closer to the centre of the Earth (ie the ground in this case). Thus, the density of air is the highest on the ground (plains) and reduces as you go higher (like up a mountain). Since our bodies sense this heat as temperature, the higher you go, the cooler it is.

  • When we go on to a higher altitude, the atmospheric pressure increases and this is known as the principle of thermodynamics. This is the same principle which happens when the fridge cools down and the compressed coolant gets out of the nozzle. So it gets colder when we go higher and higher.

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  • Atmosphere has many layers such as troposphere, stratosphere, mesosphere and nano sphere. Temperature drops
    .5 degree Celsius at every 62.5 meter height as we go up. Suppose one hill station is situated 1000 meter above sea level, its temperature will be 1000/125=8 degree Celsius below the normal temperature at sea level.I think now the concept is clear.

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