A drop of petrol makes a finger colder than a drop of water would because?
Answer Details
A drop of petrol makes a finger colder than a drop of water would because petrol takes its latent heat of vaporization from the finger. When a liquid evaporates, it needs heat to convert from a liquid to a gas. This heat is called the latent heat of vaporization. When a drop of petrol evaporates from a finger, it takes heat from the finger to convert into a gas, thus making the finger feel colder. Water, on the other hand, also evaporates and takes heat from the finger, but it has a lower rate of evaporation than petrol and requires more time to evaporate, resulting in a slower cooling effect.