Science / Chemistry / pH: Ph is a measure of effective concentration of hydrogen ions in a solution. It is approximately related to the molarity of H+ by ph = - log [H+]


Business / Finance / Alpha: Measure of risk-adjusted performance. An alpha is usually generated by regressing the security or mutual fund's excess return on the S&P 500 excess return. The beta adjusts for the risk (the slope coe MORE

Subcutaneous Emphysema

Health / First Aid / Subcutaneous Emphysema: Subcutaneous emphysema can be a sign of collapsed lung (pneumothorax). MORE

Nasopharyngeal Airway

Health / First Aid / Nasopharyngeal Airway: Learn the definition of nasopharyngeal airway. MORE

Oropharyngeal Airway

Health / First Aid / Oropharyngeal Airway: An airway adjunct placed in the mouth to help keep the pharynx open. MORE


Science / Tides and Currents / Oceanography: Oceanography is the science of all aspects of the oceans, in spite of its etymology. The term, oceanography, implies the interrelationships of the various marine sciences of which it is composed. This MORE

Phillips Curve

Business / Finance / Phillips Curve: A graph that supposedly shows the relationship between inflation and unemployment. It is conjectured that there is a simple trade-off between inflation and unemployment (high inflation and low unemplo MORE