Clouds form when liquid water from rivers, ponds, oceans, lakes, swimming pools, etc. evaporate. Evaporate means to change from a liquid to a gas (at a temperature that is lower than the boiling point of water–212 degrees F or 100 degrees C). Since water is usually a liquid, its generally called water vapor to indicate […]
Atmospheric Temperature vs. Altitude
Temperature is a physical property of how hot or how cold matter is. Cold Objects have a low temperature. Hot Objects have a high temperature. A thermometer is the instrument used to measure temperature.There are several different thermometer scales, the diagram shows a model of a Celsius thermometer. Note that this scale is marked in […]
Air Pressure vs. Altitude
The gravitational attraction between the Earth and its atmosphere is greatest near the Earth’s surface. As a result, the density of air molecules is greatest near the Earth’s surface and decreases as the distance from Earth’s surface increases. The greater the density of air molecules the greater is their pressure. Air pressure is greatest at […]