Calculating Delta P in Vacuum Chambers: P1 or 0?

[ahmed11]

in calculating the delta p in vacuum chambers do we substitute p1 with 0 or the whole equation doesn't exist if air doesn't exist?

 

[CrazyNinja]

Could you elaborate on what it is that you are exactly talking about?

 

[ahmed11]

Could you elaborate on what it is that you are exactly talking about?

i mean if we shook a cola can in vacuum chamber then the driving force when opened will be zero because there is no delta p. right?
without air then there won't be delta p.
or we assume that p 1 is equal to p2 is equal to zero?
do you get what i mean

 

[CrazyNinja]

Why do you think there is no ΔP? (In case you are wondering, there is a "symbols" section in the text from where you can get a "Δ" ). The cola bottle is packed with high pressure and the pressure outside is close to zero.