Why Is There Vacuum Above The Level Of Mercury In A Mercury Barometer?

Why Is There Vacuum Above The Level Of Mercury In A Mercury Barometer? The top of the barometer is filled with nothing (vacuum) because the mercury must have the space to expand and contract without any other force affecting it; a gas or liquid in the top would have its own pressure against the mercury

Can You Vacuum Blown Insulation?

Can You Vacuum Blown Insulation? If removing blown-in insulation, use a HEPA or ULPA vacuum cleaner only, available at equipment rental services and home improvement centers, to suck the insulation out of the wall or cavity it is in. Regular vacuum cleaners will only blow the fiberglass fragments throughout the structure you are working in.