vacuum is the absense of pressure
vacuum - i
They mean that there are no air particles in space.
The different flashing lights on the Roomba vacuum mean refer to different status of the battery.
it means your a vacum.
It's a space where there is no matter. A perfect vacuum will have no gas particles at all.
If you mean radio-frequency, yes, all electromagnetic waves can travel in a vacuum.
an electron tube containing a near-vacuum that allows the free passage of electric current.
As an adjective, it means empty.
get a vacuum and suck it up...
Humans can, if that's what you mean.
It means "vacuum cleaner".
If you mean specifically, what type of vacuum, the answer is manifold vacuum. Manifold vacuum is constant and doesn't, change with throttle valve opening, the way ported vacuum does.