All EM radiation carries energy and the higher the frequency more energy is carried by each photon but that doesn't mean that the energy is transferred as heat (i.e. increase in temperature of the body).
The reason why IR is felt as heat is because it has the right wavelength to excite atoms and molecules unions into resonance.
> IR light is not ionizing, but we associate it with heat because the black-body radiation of things we generally interact with (humans and stovetops, for example) is mostly in the infrared spectrum.
In particular, this relationship is backwards. We don't associate heat with those objects because they happen to emit in the infrared. Since they emit in the infrared, they are good at heating (i.e. exciting molecular unions into vibration modes that make most of the energy stored). This is related to the fact that most of the mass of an object is associated to the nucleus, instead of the electrons. If it was the contrary, exciting electrons into higher energy states would be a better way to transfer energy into an object.
On the other hand, UV protection is good to prevent high energy being transferred into electrons which then get excited into higher energy states messing up electronic bonds and potentially our DNA.
The reason why IR is felt as heat is because it has the right wavelength to excite atoms and molecules unions into resonance.
> IR light is not ionizing, but we associate it with heat because the black-body radiation of things we generally interact with (humans and stovetops, for example) is mostly in the infrared spectrum.
In particular, this relationship is backwards. We don't associate heat with those objects because they happen to emit in the infrared. Since they emit in the infrared, they are good at heating (i.e. exciting molecular unions into vibration modes that make most of the energy stored). This is related to the fact that most of the mass of an object is associated to the nucleus, instead of the electrons. If it was the contrary, exciting electrons into higher energy states would be a better way to transfer energy into an object.
On the other hand, UV protection is good to prevent high energy being transferred into electrons which then get excited into higher energy states messing up electronic bonds and potentially our DNA.