Answer:
Force,
![F=2.02* 10^6\ N](https://img.qammunity.org/2020/formulas/physics/college/uzr066724jcx52fgr29p3swbkapr49jt0a.png)
Step-by-step 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,
![P=1\ atm=101325\ Pa](https://img.qammunity.org/2020/formulas/physics/college/z4sd69x6k9ct6tnkuy7s6tlm72wfik0cc5.png)
We know that the force acting per unit area is called pressure exerted. Its formula is given by :
![P=(F)/(A)](https://img.qammunity.org/2020/formulas/physics/college/w6dmjhgoa2nqzut32hmrr8jf5dlyl9vj0l.png)
![F=P* l* b](https://img.qammunity.org/2020/formulas/physics/college/ynrswe9yqn5znvvccavs9pu3nyj2l9vzeh.png)
![F=101325* 4* 5](https://img.qammunity.org/2020/formulas/physics/college/qesx2rrtqpn61hsoxfacqwfj73hwdambz1.png)
![F=2.02* 10^6\ N](https://img.qammunity.org/2020/formulas/physics/college/uzr066724jcx52fgr29p3swbkapr49jt0a.png)
So, the total force on the floor due to the air above the surface is
. Hence, this is the required solution.