Why does our palm feel cold when we put on some acetone or petrol or perfume on it?
Acetone, petrol, and perfume are volatile substances that get evaporated when they come in contact with air. Evaporation is facilitated as it uses energy from palm hence leaving a cooling effect on our palms.
Name A, B, C, D, E and F in the following diagram showing a change in its state.
What produces more severe burns, boiling water or steam?
Why is ice at 273K more effective in cooling than water at the same temperature?
Give two reasons to justify -
(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.
What is the physical state of water at -