Understanding Heat Transfer in Everyday Life

Heat doesn't need anything to travel through space. While conduction needs solids and

convection needs liquids or gases, radiation can move through complete vacuum.

That's how the sun's heat reaches Earth across millions of miles of empty space.

This is why your face feels warm in sunlight even on a cold day. The craziest part

is how surfaces matter. Dark and dull objects absorb heat way faster than shiny

bright ones. That's why wearing black in summer makes you sweat buckets while white

keeps you cool. Engineers use this knowledge everywhere. Steel bridges have gaps built in because

metal expands in heat and would buckle without room to grow. Even fire alarms