A drinking straw is placed in a glass of water. A student places their finger over the top opening of the straw and lifts the straw vertically a distance d with the water in the straw staying in the straw. Refer to the figure. Point B is at the surface of the water in the straw and point A is at the surface of the water in the glass. a) Enter an expression for the difference in pressure ΔP = PB - PA between points B and A of the water, in terms of d, the density of the water, ρ, and the acceleration due to gravity, g.  b)Calculate that pressure difference, in pascals, for d = 15 mm and ρ = 1.00×103 kg/m3.  c)The straw is cylindrical with a radius of 2.5 mm. What is the weight of the water in the straw, in newtons?

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.