Well, tangible does mean “ perceptible by touch.” So, perhaps, air is not “tangible”. Nor is it, in some sense “visible”. OTOH, it is detectable by various means. Including, perhaps most importantly to us, breathing. As far as radio waves are concerned, all of us using WiFi have a very dependable way of perceiving them, our computer.

When we try to describing something which cannot be detected by any means available to us, it is perfectly natural to think of it as not existing in the material world. If the only way you can perceive it is in your mind, then it is likely not real and is “only in your head”.

Geez Louise, what are they putting the water over there in India?

OK, I got it. We cannot see radio waves so they exist without being tangible. So what? How does this help you with the invisible man? I cannot see cold and flu germs either in normal circumstances.

The number 2 exists, but it is not tangible.

I do have to commend the caller for essentially admitting he was wrong. Most people, even here, will not do that.

And so what?

not disagreeing, but after all "exist" implies "objective evidence" in most definitions?

What the fuck is "Tangable"?

A Tan gable would be the end wall of a house painted light brown.

The word is Tangible