✅ Sinking air always creates High Pressure —
Because when air sinks, it compresses and piles up at the surface → meaning more air molecules are pressing down → creating High Pressure, even if the air becomes warm.
✅ In subtropical High Pressure belts (around 30° North/South),
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The air sinks.
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Clear skies form (no clouds).
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Strong sunlight directly heats the land → very high temperatures.
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But still, pressure remains high because of the sinking movement.
✅ Therefore, deserts like Sahara, Kalahari, Thar, Atacama are located under High Pressure belts, even though they are extremely hot.
✅ At 30° N/S (subtropical regions),
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Air sinks → High Pressure (HP) → Clear skies → NO rain → Deserts form (like Sahara, Thar, Australian deserts).
Now your confusion:
"If deserts are hot, isn't hot air Low Pressure (LP)?"
👉 Answer:
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Deserts are hot because of strong sunlight.
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BUT the pressure is still High, because the air is sinking and piling up on the ground.
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The heat is due to sun and clear skies (no clouds to block sunlight), NOT because of Low Pressure.
Important point:
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Temperature and Pressure are not always directly linked.
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Sinking air = High Pressure always, even if it gets hot later.
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Rising air = Low Pressure, even if it’s cold.
Why deserts form at HP belt:
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Sinking air → no clouds → no rain → dry → hot → desert.
✅ Summary:
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Sinking = High Pressure.
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High Pressure + Strong sunlight = Hot deserts.
🌟 Super simple:
"Air movement decides pressure.
Sunlight decides heat.
Deserts are hot because of sunlight, but pressure is high because of sinking air."
🌟 Summary Tip:
"Pressure depends on how air moves (sinking or rising).
Temperature depends on sunlight.
Sinking = High Pressure, even if the air gets hot later!"