1. MATTER IN OUR SURROUNDINGS
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एसीटोन/पेट्रोल या इत्र डालने पर हमारी हथेली ठंडी क्यों हो जाती है ?

Option A
Option B
Option C
Option D

Solution

Acetone, petrol, perfume etc., being volatile, evaporate very fast when exposed to larger surfaces. During the process they absorb the required latent heat of vaporization from the palm (if kept on palm). So, the process causes Cooling and the palm feels cool.

Standard 9
Science

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