When a pressure cooker is half filled with water, and heated to boiling point, then the pressure inside the cooker will?
-
A.
decrease, since only a fraction of the water molecules has changed to vapour -
B.
remain constant, because the total number of water molecules has not changed -
C.
increase, because the water molecules can now reach every part of the sealed tube -
D.
decrease, since water boils under reduced pressure -
E.
increase, because the water vapour molecules now strike the walls of the tube more frequently because of their increased velocity