Question

hacksaw blade is heated at one end over a flame how does the colour of his strip change how can you get it back its original colour​

Answer 1

Answer: Hold a hacksaw blade in a long and keep it on the gas stove. It turns red. Now cool the tip of the blade, you will get its original color.

Explanation:

Hacksaw blade changed color on heating. In this process, physical changes occur so it's color will be altered.properties such as shape, size, color, and state of a substance are called physical properties.

A change in which a substance undergoes a change in its physical properties is called physical change.

Physical change is generally reversible.

Answer 2

answer in the above photo