What is Energy?
- Thread starter Willem
- Start date
Photons are not energy.
I do not know what that means.
Good question.
From Wiki on energy:
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
That is a pretty good definition.
That is more of an example than a definition. The higher the energy that a photon carries the shorter the wavelength.
exchemist
Valued Senior Member
Energy is a property of a physical system, with dimensions ML²/T². Like linear and angular momentum, it is a property that is conserved, in a closed system. There are many definitions, perhaps the commonest being the ability to do mechanical work.
One of the important things to realise about energy is that it is not "stuff". It is not an entity, it is an attribute. You cannot have a jug of energy.
A photon therefore is not energy. A photon is a physical entity that has energy as one of its properties.
RainbowSingularity
Valued Senior Member
any occlusion of content or activity that creates instance of measurable occurrence in any instance
And heat, and work, and potential energy in various forms, and more besides.
You mean kinetic energy?
Raisins are really dried grapes.
That should win an award for the worst definition energy ever, unless that was a joke, in which case - ha ha good one.
The "more" must include the uncreated energy that must have existed in the "nothing" before the beginning of this universe of ours.
There were supposed to have be virtual energy manifestations (whatever that means) , such as virtual phenomena popping in and out of existence, but simply put, some primordial, uncreated form of Ur- , latent.potential to produce must ave always be present.
exchemist
Valued Senior Member
Ah Glasshopper, velly mystical. It seem you have been smoking stlange substance.
Grasshoppers can be a plague, but jump amazingly high for their size. so, from a more elevated viewpoint, and zero gravity, I hoped that we would get a common peak beyond the horizon, assuming that laws of nature are valid there too. For example: that energy can not be created. But could have exotic forms in that pre-matter domain.
never smoked. like mirrors though.
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In the ALMA thread I refer to energy as uncreated, indestructible. The Energy that would have had to existed in the pre-BB timespace , that in part turned into matter, an Ur - energy that might not have had any of the energy forms we deal with here and now. but
your observation is interesting. light has pressure, no mass, but pressure, like a wave breaking on shore. That wave stored energy, and so must light. You suggest a good light light battery. stored light! Musk must be interested.
Light energy would be good to store, it does not age, or move through time.
How does light produce pressure without mass , on mass ?
The shore is matter based .
Light is based on physical three dimensional objects giving off energy .
Better minds than I can give the details, but if light is reflected, the pressure is doubled, solar sails are based on that.
The wave shore brake is only a good illustration from the surfing, riding to wipe out experience, trust me.
light may be only a 2 dimensional, rotating wave. and
Taking it a step further, back in time, before the universe, energy might have had a form even simpler, non-dimensional, but being all pervasive, uncreated, filling timespace, un-moving** existing in energytime, as outlined in the ALMA thread. thank you.
** even here, light energy does not age, move through time. Zero t in the equations.
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