Question

calculate the mass of air enclosed in a room of dimensions 5m,3m,4m .take density of air as 1.3kg/m3

Answer 1

volume of air in room = volume of room

Volume of the room = lbh
= 5*4*3 = 60 cubic metre
density = mass / volume

1.3 = mass / 60

So,
mass = density * volume
= 1.3 * 60
=78 kg

Answer 2

Given :

Dimensions of room is 5m , 3m , 4m .

Density of air , $d=1.3\ kg/m^3$ .

To Find :

The mass of air enclosed in the room .

Solution :

Volume of room ,

$V=l\times b\times h\\\\V=5\times 3\times 4\ m^3\\\\V=60\ m^3$

Now , mass is given by :

$Mass=d\times V\\\\Mass=1.3\times 60\ kg \\\\Mass =78\ kg .$

Therefore , e the mass of air enclosed in the room is 78 kg .

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Density and volume

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