Answer:
the hydrogen filled balloon is denser than the air filled balloon
I have no idea what you are trying to ask sorry
28 degrees celsius converts to 82.4 degrees in Fahrenheit :)
Answer:
You're right already. It's B)
Answer:
Force, 
Explanation:
It is given that,
Length of the room, l = 4 m
breadth of the room, b = 5 m
Height of the room, h = 3 m
Atmospheric pressure, 
We know that the force acting per unit area is called pressure exerted. Its formula is given by :




So, the total force on the floor due to the air above the surface is
. Hence, this is the required solution.