The transfer of energy through matter by the direct contact of particles is called conduction
Period = 0.5 second is the answer.
4 to 1
Explanation If you look at it as a fraction 160/40 and you reduce it down as far as you can you get 4/1
Because it has a small hole and air is like water, an area of higher pressure wants to move to a lower pressure area.
By just smiling. It normally makes you look more happy.And if your happy that's positive body languge