definition
A region of space that contains no matter.
definition
(plural only "vacuums") A vacuum cleaner.
definition
The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.
example
a vacuum of 26 inches of mercury, or 13 pounds per square inch
definition
A spacetime having tensors of zero magnitude
Many other devices have been introduced for facilitating the production of vacua.
For the production of high vacua, see Vacuum Tube; Liquid Gases.
Crookes, who had found that some delicate weighings in vacua were vitiated by this cause.
Hittorf examined the phenomena exhibited in so-called high vacua, that is, in exceedingly rarefied gases.
The invention of the barometer and Torricelli's explanation of the vacuity above the mercury column placed before the members of the Florentine academy a ready method of obtaining vacua; for to exhaust a vessel it was only necessary to join, by means of a tube provided with stopcocks, the vessel to a barometer tube, fill the compound vessel with mercury and then to invert it in a basin containing this liquid, whereupon the mercury column fell, leaving a Torricellian vacuum in the vessel, which could be removed after shutting off the stop-cocks.
Later he investigated the gas-absorbing powers of charcoal when cooled to low temperatures, and applied them to the production of high vacua and to gas analysis (see Liquid Gases).
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