re: How do you explain the fact that
If I put a Kilogram of butter on a scale, the scale indicates one Kilogram of weight?
I explain it by saying that 1Kg mass multiplied by one Earth’s Gravity of force equals 1 Kg of weight.
Air mass has weight, therefore the air presses against the Earth’s surface with that weight.
Do you have a different interpretation?
Or should I point out web sites that explain it in greater detail, like preschool level?