L3 Gas Pressures Flashcards
What is Dalton’s Law?
the total barometric pressure is the sum of the pressures of each of the individual gases
partial pressure - the amount of collisions just for one species of gas
gases will ALWAYS travel down what?
their partial pressure gradients - from areas of high to low partial pressure
sometimes they can travel down concentration gradients…
how do you calculate the partial pressure?
atmospheric pressure x precent in air = partial pressure
Patm = 760 mmHg X 0.21 O2 = 159.6 mmHg of Oxygen
what happens to barometric pressure as you increase altitude?
partial pressure decreases
- there are less collisions
- percent of each gas stays the same!
what happens when water is added to gas?
partial pressure must be repartitioned because you must account for the addition of water
dry air O2 PP = 159.2
water sat. air O2 PP = 149.37
partial pressure decreases with water addition!
what is Henry’s law?
Dissolved gas (content) = solubility coeff x partial pressure of gas
if you want to the know mass/content of the gas
if solubility is low, so is mass of dissolved gas
what does partial pressure predict?
gas transport rates!
