Suppose you have a glass filled with water. Now you insert a straw in that glass.
Is the air pressure inside the straw greater than the atmospheric pressure on the water outside it?(I think it is greater, as the bottom of the straw is deeper than the water level of the glass, so the weight of the air above it is greater. And also because the straw has a smaller surface area. Please confirm it)
If my after mentioned assumption is correct, then the atmospheric pressure in the straw is higher than that of the outside. So why does water get into the straw then(until both water levels become equal)?Why isn't the force exerted on the end of the straw(by this higher atmospheric pressure inside the straw) enough to prevent water from entering it?
And finally does water entering the straw from the glass have anything to do with pressure at all? Or does it only depend on the Force exerted? Because then it makes sense. Even though the pressure inside the straw is greater than the outside,(My after mentioned assumption) I don't think the overall force exerted on the water outside the straw by the atmosphere is less than the force exerted by the atmospheric pressure inside the straw. So that's why it pushes the water up the straw. Is this correct?