Integrated SequencePhysics Chemistry Organic Biology

Web Resources

  click if a link is broken

Special points of emphasis

The States of Matter


The Respiratory System

Henry's Law states that the solubility of a gas in a liquid is proportional to its partial pressure in the gaseous phase in contact with the liquid. In other words, the number of molecules of gas dissolved in solution is proportional to the partial pressure of the gas.

Henry's law helps to predict the amount of each gas which will go into solution. However, different gases have different solubilities which a constant of proportionality in the law takes into account.

The MCAT loves straightforward questions on Henry's Law because it is one of those physical science principles directly applicable to medical education. Henry's Law is crucial to the understanding of gas exchange in the lungs. Blood entering the lungs contains more carbon dioxide than would correspond to the partial pressure of carbon dioxide in the alveolar air, so carbon dioxide gas leaves the blood and enters the lungs. The opposite situation applies to oxygen gas, so oxygen leaves the alveolar air to enter the blood.

The WikiPremed MCAT Course is a free comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum.

Please read our policies on privacy and shipping & returns.  Contact Us.
MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course.

Creative Commons License
The work of WikiPremed is published under a Creative Commons Attribution Share Alike 3.0 License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions. You can use the resources here for commercial or non-commercial purposes, but please give attribution and a link to the production credits and edit history of the resource. For the works here which began as my individual work, please attribute "John Wetzel, an author at".