I need help with this chemistry problem. Please explain your answers if it isn't too much trouble

Question

Intravenous infusions are often made under gravity as shown below. Assuming the density of

the fluid is 1.00g/cm³ at what height h should the bottle be placed so the liquid pressure is

(a) 55 mmHg,

(b) 650 mmHg.

(c)If the blood pressure is 18 mmHg above atmospheric pressure,

how high should the bottle be placed so that the fluid just barely enters the vein?

Answer 1

Hi Knut R.,

This isn't chemistry, just basic physical science. A liquid column, that's your IV line!, exerts pressure 760 mm Hg = 1 atm =~ 33 ft of water pressure. You can do the conversions from there, you just ratio those heights to that of 760 mm Hg (well, you know what I mean). So 18/760 * 33 ft ~~ 9.4 inches, for example.

-- Cheers, --Mr. d.