5
Burning: where did it go?
Words to learn: burning • fuel • air • ash
A log seems to disappear when it burns. Where does it go?
WHAT DOES BURNING NEED?
A fire needs something that can burn, enough heat to start it, and air.
WHAT HAPPENS TO THE LOG?
As the hot wood combines with oxygen from the air, new materials are made and heat is given out.
WHERE DID IT GO?
Only a little remains as ash. Much of the log has become invisible gases that escape into the air.
WHAT YOU NEED TO KNOW
NOW LOOK AT THE TEXTBOOK
