Energy is not lost or destroyed
Quote by Einstein: “Energy cannot be created or destroyed, it can o...”
Fact or Fiction?: Energy Can Neither Be Created Nor Destroyed
It is not destroyed but dissipated away as heat. Energy Conservation Principle includes all forms of energy mechanical, thermal, That is different for the Mechanical Energy conservation condition. These two are often misunderstood to be the same. Energy Conservation Principle is more general and is always true. But the Mechanical Energy conservation is true only if the system has purely conservative forces gravitational force, electric force etc and is free from any dissipative forces friction, drag, viscosity etc. Since energy cannot be destroyed, what do we mean when we say that energy is lost from a system?
The conservation of energy is an absolute law, and yet it seems to fly in the face of things we observe every day. A battery produces power. A nuclear bomb creates an explosion. Each of these situations, however, is simply a case of energy changing form. The law of conservation of energy , also known as the first law of thermodynamics, states that the energy of a closed system must remain constant—it can neither increase nor decrease without interference from outside. The universe itself is a closed system, so the total amount of energy in existence has always been the same.
In a typical car, the initial starting energy is stored in a battery. The chemicals in the charged-up battery are not in their lowest free-energy state. Then once the motor starts, the energy comes from combining the fuel with oxygen, which also lowers the chemical free-energy. By atoms jiggling we just mean that they move around, with some kinetic energy. They also squash into each other as they jiggle, and that raises their potential energy.
The laws of thermodynamics define fundamental physical quantities temperature, energy, and entropy that characterize thermodynamic systems. In order to avoid confusion, scientists discuss thermodynamic values in reference to a system and its surroundings.
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes. If one adds up all the forms of energy that were released in the explosion, such as the kinetic energy and potential energy of the pieces, as well as heat and sound, one will get the exact decrease of chemical energy in the combustion of the dynamite. Conservation of energy can be rigorously proven by Noether's theorem as a consequence of continuous time translation symmetry ; that is, from the fact that the laws of physics do not change over time. A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist, that is to say, no system without an external energy supply can deliver an unlimited amount of energy to its surroundings. Examples include curved spacetimes in general relativity  or time crystals in condensed matter physics.
But what if instead of looking at death from a biological perspective, we examine it from a physics standpoint? In life, the human body comprises matter and energy. That energy is both electrical impulses and signals and chemical reactions. The same can be said about plants, which are powered by photosynthesis, a process that allows them to generate energy from sunlight. The process of energy generation is much more complex in humans, though. Mostly, we get it through the consumption of food, which gives us chemical energy.