Albedo is a measure of reflectivity, expressed on a scale from 0 to 1. A perfectly black body has an albedo of 0 because it absorbs all incoming radiation and reflects nothing. In contrast, a perfect white surface (like fresh ...
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Anemometers are instruments designed to measure wind speed and, in some designs, wind direction. The most common type is the “cup anemometer,” which features three or four cups that rotate when the wind blows. The speed of the rotation is ...
A 22-degree halo is a ring of light that forms around the Sun or Moon when its light is refracted through hexagonal ice crystals found in high-altitude cirrus clouds. These crystals act like tiny prisms, bending the light at a ...
The Normal Lapse Rate is the average rate at which air temperature decreases with increasing altitude in the troposphere. The standard value is approximately 6.5°C for every 1,000 meters (or 3.6°F per 1,000 feet). This rate is used by scientists ...
The Aurora Borealis (Northern Lights) occurs when charged particles from the sun—the solar wind—interact with the Earth’s magnetic field. These particles are funneled toward the poles, where they collide with oxygen and nitrogen atoms in the ionosphere. These collisions release ...