Răspuns :
Presiunea e F/S, deci F=p*S.
S=1.5*√3 m^2, adica 0.026 m^2.
p=20torr=2666 Pa.
F=69.33N.
1 torr = 1 mm coloana de mercur
1 mm coloana de mercur =133,32 Pa
p=20 torri=2666,44 Pa
S=1,5√3 dm²=2,59 dm²=0,0259 m²
p=F/S=>F=pS=2666,44*0,0259=69,19 N