The restaurant Bistro-an-Maine-Street is located on the fourth floor of a certain building. Part of the restaurant's "character" is that the beverages are served on the first floor with a straw leading up to the fourth-floor customers 12 meters up. The joke is that customers cannot manage to drink their beverages. One night a chemist brings along a vacuum pump from her laboratory. Assume the pump can draw a perfect vacuum.
Assume also that surface tension of the beverage plays no role, and we have
Patm = 105 Pa,
ρbeverage = 103 kg/m3,
g = 10 m/s2,
ρair = 1.2 kg/m3,
R = 0.0821 L atm/K mol, and the radius of the straw rstraw = 3 x 10 –3 m.
Consider the following possibilities:
I. Use a straw of smaller radius.
II. Drink a beverage which has a smaller density.
Which option will help a customer to draw the beverage up the straw?