Earnings: Amgen, Inc., United States Steel Corporation, Western Digital, More (AMGN, X, WDC, More) January 27, 2015. After the bell on Tuesday, a number of big name, dividend paying companies announced their quarterly earnings. Below, we look at these earnings reports and break down the important points for investors.
As temperature increases, the density of liquids and gases decreases; as temperature decreases, the density increases. Density is the amount of mass per unit of volume.
So, you can see that density, temperature and pressure work together to change the conditions of the air. When heat is added, air temperature and pressure both increase. And, when the density of air changes, the pressure (and sometimes the temperature) does as well.