The Origin of Heat Energy On Earth
Earth's proximity to the Sun is the reason that almost everything near Earth's surface is warm with a temperature substantially above absolute zero. Solar radiation constantly replenishes heat energy that Earth loses into space and a relatively stable state of near equilibrium is achieved. Because of the wide variety of heat diffusion mechanisms (one of which is black-body radiation which occurs at the speed of light), objects on Earth rarely vary too far from the global mean surface and air temperature of 287 to 288 K (14 to 15 °C). The more an object's or system's temperature varies from this average, the more rapidly it tends to come back into equilibrium with the ambient environment.
Read more about this topic: Thermal Energy
Famous quotes containing the words origin, heat, energy and/or earth:
“Art is good when it springs from necessity. This kind of origin is the guarantee of its value; there is no other.”
—Neal Cassady (1926–1968)
“And oh, I knew, I knew,
And said out loud, I couldn’t bide the smother
And heat so close in; but the thought of all
The woods and town on fire by me, and all
The town turned out to fight for me that held me.”
—Robert Frost (1874–1963)
“The persons who constitute the natural aristocracy, are not found in the actual aristocracy, or, only on its edge; as the chemical energy of the spectrum is found to be greatest just outside of the spectrum.”
—Ralph Waldo Emerson (1803–1882)
“It is true, there are the innocent pleasures of country life, and it is sometimes pleasant to make the earth yield her increase, and gather the fruits in their season; but the heroic spirit will not fail to dream of remoter retirements and more rugged paths. It will have its garden-plots and its parterres elsewhere than on the earth, and gather nuts and berries by the way for its subsistence, or orchard fruits with such heedlessness as berries.”
—Henry David Thoreau (1817–1862)