Apiston above a liquid in a closed container has an area of 1m2. the piston carries a load of 350 kg. what will be the external pressure on the upper surface of the liquid? a. 4.90 kpa b. 3.43 kpa c. 27.3 kpa d. 68.6 kpa

The weight of the load is (mass) x (gravity)

                               = (350 kg) x (9.8 m/s²)

                               =        3,430 newtons .

The force on the surface of the liquid is the weight of the piston and its load.

The pressure on the surface of the liquid is  (force) / (area) 

                                                             =  (3,430 newtons) / (1 m²)

                                                             =  3,430 pascals

                                                             =      3.43 kPa

This doesn't include anything for the weight of the piston without its load,
but it's certainly the closest of the choices.

Gas is all around us which means that the atmosphere