Evaporation causes cooling because the water molecules need energy to turn into vapor, which they take from our bodies—that's why desert cooler ka paani garmi mein bhi thanda lagta hai! The four factors are temperature, surface area, wind speed, and humidity. Par yahan Rajasthan mein, hawa itni sukhi hai ki evaporation tez hoti hai, toh cooler kaafi achha kaam karta hai—humare yahan to high humidity wala factor practically matter nahi karta, kyunki humidity kabhi high hoti hi nahi!
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