Why is ice at 273 K more effective in cooling than water at the same temperature?

Why are medicines more effective in colloidal state ?

Why is cleansing effect of soap not effective in hard water?

Why does a metal bar appear hotter than a wooden bar at the same temperature? Equivalently it also appears cooler than wooden bar if they are both colder than room temeperature.

Explain why the internal eneryg of a compressed gas is less than that of a rarefied gas at the same temperature.

Water is more acidic than alcohol

Why aquatic species feel more comfortable in cold water than hot water ?