Question

effect on pressure if the area is doubled keeping force constant

Answer 1

Hello Dear !
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As you know ,
P = F/A
where P = pressure 
           F = Force 
           A = Area 
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if the  area is doubled Then the pressure applied is halved 
see...
let    P1 = F/A
then P2 = F/2A
P1/P2   = A/2A
P1/P2   = 1/2 
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Answer 2

Pas. = N/m²

Let us assume N = 1 and m = 1

Pas. = 1/(1)²

Pas. = 1

Now,

Let the area, m= 2

Pas. = 1/(2)²
Pas. = 1/4

Pas. = 0.25

Here the pressure becomes ¼. That is pressure decreases.

I hope this will help you.