sun is a heat ,Heat Transfer

in sun •  7 years ago 

he core of the sun is so hot and there is so much pressure nuclear fusion takes place hydrogen is The core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat and photons

At the core of the sun, gravitational attraction produces immense pressure and temperature
which can reach more than 27 million degrees Fahrenheit (15 million degrees Celsius). Hydrogen atoms get compressed and fuse together,
creating helium. This process is called nuclear fusion.
When there is heat at the bottom of this air or water,the air or water molecules in contact with the heat start to move, and the molecules spread apart. The heated air or water becomes less dense. It rises up until it gets to air or water with the same density as it has, and when it gets there, it pushes the air or water that was there out of the way. At the same time, new air or water fills the space that was vacated when the heated molecules rose up. The air or water that gets pushed out of the way falls down. This sets up a circular motion. Air or water is heated at the bottom, travels to the top, cools, gets denser, falls, is heated again and the whole cycle starts again.
Convection does not occur in space because there is no gravity.

                    Heat Transfer

Some of the heat energy from the sun bounces back off the earth's atmosphere,
but some of it gets through and reaches the earth's surface.
The energy that does reach the earth's surface warms it. The extra energy causes chemical reactions,
which give off heat again as a by-product--this heat is released through the same process of thermal radiation.
Some of the heat energy is trapped by the greenhouse gases in the atmosphere,
and the temperature of the earth rises

                         Heating the Earth

Some of the solar energy that arrives at the Earth bounces off the atmosphere and clouds and back into space. The surface of the Earth receives about half of the incoming solar radiation. The solar energy takes the form of heat and visible light as well as ultraviolet rays, the type of energy that causes sunburn. The energy is absorbed by matter, including air, water, rocks, buildings, pavement and living things, and the matter is heated as a result. The Earth does not heat evenly, chiefly because some areas receive more solar radiation than others. The differences in energy drive the winds and ocean currents across the entire planet.

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