You are watching: What happens to mass and energy in a closed system
If a system deserve to exchange energy with that surroundings, it"s not a closeup of the door system and also conservation of energy doesn"t apply. Earth, because that example, is not a closed system due to the fact that it have the right to both receive heat from the sun and also radiate warmth into space. Because it"s an open up system, its complete energy have the right to change. The world as a entirety is a closed system because as much as us know, it"s not in contact with any other solution or universes. Subsequently the complete energy of the universe stays unchanged.
Energy have the right to take numerous different forms. An item that"s moving, because that example, has actually kinetic power or power of motion. Things raised high above the ground has actually gravitational potential energy due to the fact that gravity is pulling top top the object and also causing it come "want" come fall. Irradiate from the sunlight is power in the form of radiation. The molecule in her food have chemical potential power that you deserve to extract with digestion, and your human body has energy in the most obvious type of every -- heat.
In the universe as a whole, power is never destroyed -- that just changes forms. Once a rock falls, because that example, the gravitational potential it possessed by virtue that its height is turned right into kinetic energy, and also when the strikes the ground the kinetic power turns right into heat. Plants take radiation and convert the power it contains into chemical potential energy that you in turn extract when you eat your food. A strength plant takes chemistry potential energy in coal and also turns that into electric energy. In all of these scenarios, energy is just transforming forms.
The very first Law of Thermodynamics is another means to state the law of preservation of energy. It states that for any kind of system, the change in its total energy is same to the lot of work-related it go minus the lot of power transferred to it together heat. This is simply another means to describe the exact same idea, since the energy of the device remains continuous unless that receives power in the form of either job-related or heat.
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Based in mountain Diego, man Brennan has been writing about science and also the environment because 2006. His posts have appeared in "Plenty," "San Diego Reader," "Santa Barbara Independent" and also "East just Monthly." Brennan stop a Bachelor of scientific research in biology native the college of California, mountain Diego.