(4.3 x 10-2 )4.950 x 105)
O 21.285 x 103
O 2.13 x 104
O 21 x 103
O 2.1 x 104

conservation of mass

mass before something happens = mass afterwards

k2s for potassium sulphide

the ima (higher than 1m) will be greater than the ima with the height of 1m.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.