I have read about the quantisation of energy and from what I have read this is my understanding. When light is shone on an object, if it's the right amount of because one of the electrons in the atom to jump to a different level like a car changing gears or going up or down one step on the stairs. This action releases a photon with that level of energy. All light is made up of photons, the indivisible packets of energy which makes up the basis of quantum theory. However, although light can only be transmitted in whole packets, whole photons, the photons themselves can have any value. Photons can have 1 energy, 2 energy, 2.75 energy, but there is no such thing as half a photon. I imagine it's like boxes rolling along a conveyor belt, each one is identical in size and each one is a whole box but the manufacturer can have this model of box made in any size. Is that right or can light only come in a fixed number of values? The thing I find confusing is that when people talk about this they say energy is quantised. When they say energy do they mean light? Or do they mean energy itself, all forms of energy? Is electricity quantised? Heat? Gravity? Motion? Is all light quantised or only certain kinds of light? I have heard it said that absolutely everything is made of energy. If all energy is quantised as at mean that everything that exists and happens, everything that can will ever exist and have an is quantised? Does this mean life is like a digital screen and the quanta are the indivisible pixels that make up the image? On YouTube I saw a home-made documentary by young man who indeed said that absolutely everything was "stepped" every physical object, every motion we make. Part of the reason I'm thinking like this is my introduction to quantum mechanics was a documentary called Nova. When the announcer said all energy comes in discrete packets, the image on the screen broke apart into uniform cubes to illustrate this point. At once I thought you meant that every form of energy and thus absolutely everything is made up of quanta that are universally the exact same size and shape. Is that right? Also, I have read that the term quantum mechanics is misunderstood. That it's not all to do with quanta, but rather it is the study of physics at the very small level. Is that true? Some of you may remember that years ago, on this website, I started a lengthy discussion as to whether all possibilities are finite. I don't want to get back into a discussion about that here. But, the way I understand quantum mechanics, does it prove all possibilities are finite? I have also heard that quantum mechanics has been enormously successful and I'm not even sure if it's considered theoretical any more because people are using it to develop new technology. The success of quantum mechanics strikes me that none of this can be argued with. So is it possible to question the findings of quantum mechanics? If quantum mechanics is the study of the very small and and the quantisation of energy means the quantisation of light, then I for one think people should be clearer when they talk about it.