Amount of water in the air relative to total air volume

The Kelvin temperature scale was developed to relate heat energy to the motion of particles. At absolute zero, all particles are at rest. The conversion factor for a reading in Celsius would be to add 273.15 degrees

Solution produced that is sensitive to one component of the air, such as nitrogen dioxide or oxygen

Gases in the atmosphere that combine with water vapor to form acid rain, acid hail, and/or acid snow. These gases include carbon dioxide, sulfur and nitrogen compounds

Rainfall with a pH even or less than 5.6. The general range of acid rain is between 5.6 and 3.6. The lowest pH of rainfall measured was 2.0

snow with a reduced pH. The acid is released when the snow melts

The lowering of pH in rivers and lakes as a result of acid rain, sleet or snow

Energy required to initiate a reaction or process

Process or organism that requires oxygen

Bar graph used to display the age distribution of individuals within a population the data is sometimes displayed using grouped data or the display is altered to show the distribution of males and females within the population

Volume of air that has acquired its characteristics by remaining in an area for an extended period of time

Weight of the overlying atoms in the atmosphere above a point