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It means that there is something called energy that can't be created or destroyed. You can convert energy from one type to another, but you can't create new energy where there was none previously.
In any energy transformation, energy of one type is transformed into some other type. If an energy of type "A" gets reduced, than another energy, of type "B", will be increased by the same amount. Or, if several types of energy get converted, or more commonly, the energy gets converted into several types, the total increase in some type(s) of energy will be equal to the total reduction of other type(s). To put it into a simple formula, the sum of all energy changes is zero (algebraic sum, i.e., considering an increase as positive, and a decrease as negative).
Greenhouse gases, climate and temperature can all be affected by energy conservation.
There is the law of conservation of mass, and the law of conservation of energy. All three state: (Mass/Matter/Energy) cannot be created or destroyed, simply transferred.
The law of conservation of energy states that the total energy in the universe is a constant and will remain so for example ( x=y+z ). conservation of energy has to do with reducing the amount of energy used through reduced activity and/or increased efficiency in the performance of a particular task.
The law of conservation of energy states that all energy in the universe is conserved. It can not be created nor destroyed, but it can be interchanged between mechanical and non-mechanical energy.
Conservation laws are in force when a candle burns. Chemical changes occur in the materials involved in the burning, but all the atoms in the candle and the air (which supplies the oxygen needed for burning) are present in the byproducts of combustion. Nothing is lost. Chemical bonds are broken when a candle burns, and chemical energy in the molecules in the wax or paraffin is converted into thermal energy (heat) and released. But nothing is "lost" in the reaction and conservation laws are not broken.
In any energy transformation, energy of one type is transformed into some other type. If an energy of type "A" gets reduced, than another energy, of type "B", will be increased by the same amount. Or, if several types of energy get converted, or more commonly, the energy gets converted into several types, the total increase in some type(s) of energy will be equal to the total reduction of other type(s). To put it into a simple formula, the sum of all energy changes is zero (algebraic sum, i.e., considering an increase as positive, and a decrease as negative).
Its one of the expressions of it. It says that mass is a form of energy. Without it we would be wondering where all of the energy from the sun came from, but because we have the equation, we know that the conservation principle still holds
Energy conservation is that energy cannot be created or destroyed it can be transferred or transformed. We conserve energy no matter what we do. What we are really being told is to conserve usable energy which is energy not in the form of heat. We are told this to avoid the heat death of the universe this is when all the usable energy is lost due to heat.
Because they are not universally present in all areas, and are not present at all times.
There is no difference between the two, it's just another way of wording the phrase.