Energy can be created and destroyed
Quote by Einstein: “Energy cannot be created or destroyed, it can o...”
The Physics of Death (and What Happens to Your Energy When You Die)
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. As we know through thermodynamics, energy cannot be created nor destroyed.
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.
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Is energy always conserved?
That's a pretty good question, but in order to answer it we have to clarify precisely what it is physics says about the first law of thermodynamics. The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed, but instead that the total amount of energy in a closed system cannot be created nor destroyed though it can be changed from one form to another. Mass became another form of energy that had to be included in a thorough thermodynamic treatment of a system. The first thing we have to do is determine what a "closed system" is. When we look at a physical situation and draw an imaginary circle around it, we're defining a system. A refrigerator, for example, can be a thermodynamical system.
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. Everything that is not a part of the system constitutes its surroundings. The system and surroundings are separated by a boundary. For example, if the system is one mole of a gas in a container, then the boundary is simply the inner wall of the container itself.