Once the air has been expelled from the system you should not see much change in the level if everything is as it should be.
Ọ bụ ezie na ha nwere nnukwu jia elu n'etiti gia, ịkwesighi ịme mgbanwe ọ bụla dị mma na mbara ala dị ka ị ga-eme n'okporo ụzọ.