Air Jammer

While TheWeeOne was playing this evening with a clear Orbeez* which practically disappears in water I thought to invent a riddle, ya know, on the fly.
It took just a second but I KNEW at least one answer was rock-solid.

What can you feel but not see, touch but not grab?

LaGrande, perked up quickly and said:

Say it again?

and so I did, a couple of times, but I gave a caveat – that there might be more than one answer but at least ONE for sure that I knew was golden.

After only a little noodling she guessed water.
But we all agreed that you can kinda see water so that was out.
Then TheMommy, using the water guess as a springboard guessed the golden answer: air.

We all tested the air with our arms and decided that it was a great riddle, you can feel it but you can’t see it and we’re always touching it but you can’t grab it, our hands clutching at empty space in front of us.

The flush of cleverness and delight was still washing over the gunwales of my pride when a warning shot across the bow of my ego came in the form of TheWeeOne, crossing the room, with something important to say.

Hey Daddy!
Yeah?
I can grab it…see!

…and she proceeded to suck in a big gulp of air (big is relative mind you) and clamped her dimpled cheeks shut and…
…HELD HER BREATH!

’nuff said.