4. Biowing a balloon is a physical and reversible change. When the balloon bursts, it is also a physical change. Give more examples of physical change.
5. Torji blows air into a red balloon and then squeezes out the air from it. Explain why it is a
physical change.

guys plz help me

blowing a balloon is a physical change as when you blow a balloon the balloon expands but the balloon remains a balloon .there is change in Blowing a balloon is a physical change because only the size of the balloon changes , no change in chemical properties of the balloon occurs (no new substance is formed).

Explanation:

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

answer; 4 electrons;