Question

what is mean by 1 Pascal and Newton how will the pressure change if area of contact is doubled

Answer 1

1 Pascal is the amount of pressure applied on an object with 1 N force and in a surface area of 1 m²
1 newton is the force applied on an object of mass 1 kg which would accelerate with 1 m/s²

pressure = F/a
P= F/a
if area is doubled
P¹ = F/ 2a
P¹= 1/2 (F/a)
P¹= 1/2(P)
the new pressure will be 1/2 of older one

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Answer 2

1 pascal means when 1 Newton force is applied on 1 cm2 area.

And Newton is the unit of force.

2... Pressure becomes half when area in contact is doubled. because

Pressure=force/area.