air cannot be seen because it is colourless
Condensation, freezing the air.
Brownian Motion
The future cannot be seen but is always in front of you.
No, you cannot be seen on CP.
It depend on what you think. I think emotions and light can be seen and not be seen.
sible
Atom
Although electricity is everything, it cannot be seen!
Moving air or wind is difficult to see. The motion of atoms can not bee seen with the unaided eye. One can not see the motion of tectonic plates. In these examples, the phenomena are not visible but one can measure them.
The air itself cannot be seen. It's gaseous, and is finely divided to the molecular level. And the air has a very low condensation temperature, so you won't be seeing any of it like you might see water vapor in air. Smoke, dust or other particulate matter that may happen to be taken up by the air can often be seen. The air itself, the gases that make it up, cannot.
Freon is an invisible gas and cannot be seen in the air. If Freon in leaking from a container in large enough amounts and is cold enough, you may notice the condensation of moisture due to the low temperature.
Atom