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I am puzzled to know, What is the reason of hot oil make sound and explode when we pouring water on it?

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3 Answers

The liquid water changes phase when heated above the boiling point, namely it becomes a gas. When water vapor in cavitation bubbles escapes fast, it makes a mess. The sound of splashing aside, notice that nothing happens if the oil is cold.

Related fun fact: The pistol shrimp is so loud, it kills other fish by snapping with its claw.

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Shrapnel. The oil is analogous to the container that holds the explosive (water-->steam) .

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Oil heats up faster than water because it has a lower specific heat capacity. As it reaches past boiling point of waterthe water is denser than oil so its at the bottom. Then it turns into steam and the steam expands splashing the oil everywhere.

As for dropping water into already hot oil its pretty much the same. Its interface determines the rate of heat flow.

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