There are many different types of vacuum cleaner, but all of them work on the same principle of creating negative pressure using a fan, trapping the sucked-up dirt, cleaning the exhaust air and then releasing it..
The Vacuum Effect occurs when a portion of an animal population is permanently removed from their home range.
These animals may have been killed or removed by people, a natural disaster, or any other means.
The result is a temporary dip in population levels..
vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there.
It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal)..
A vacuum is a volume empty of matter, sometimes called 'free-space'.
In practice, only partial vacuums are possible..
: a space absolutely devoid of matter. b. : a space partially exhausted (as to the highest degree possible) by artificial means (such as an air pump) c. : a degree of rarefaction below atmospheric pressure..
Common vacuum pumps are based on one of the following principles [1]: Compression-expansion of the gas (piston pumps, rotary pumps, Root's (dry) pumps – to 10-3 Torr) Drag by viscosity effects (vapor ejector pumps – to 0.
1) Torr) Drag by diffusion effects (vapor diffusion pumps – to ~10-9 Torr).
Outer space has very low density and pressure, and is the closest physical approximation of a perfect vacuum.
But no vacuum is truly perfect, not even in interstellar space, where there are still a few hydrogen atoms per cubic meter..
There is no such thing as a total vacuum because it is impossible to remove all the air or particles from a space.
But partial vacuums are common.
A partial vacuum is a space with almost no air or particles inside.
Vacuums do not exist naturally on Earth..
A vacuum can be created by removing air from a space using a vacuum pump or by reducing the pressure using a fast flow of fluid, as in Bernoulli's principle..
Vacuum physics is the necessary condition for scientific research and modern high technology.
In this introduction to the physics and technology of vacuum the basic concepts of a gas composed of atoms and molecules are presented.
These gas particles are contained in a partially empty volume forming the vacuum..
A vacuum cleaner, also known simply as a vacuum, is a device that causes suction in order to remove dirt from floors, upholstery, draperies, and other surfaces.
It is generally electrically driven.
The dirt is collected by either a dustbag or a cyclone for later disposal..
The quantum vacuum may serve as a framework for a unification program in biology aimed at incorporating all relevant aspects of life into a physical picture of the organism. 93 .
You aren't creating a vacuum, but you are reducing the pressure in your lungs when you inhale.
In effect your lungs are working as a diaphragm pump.
When you pull your diaphragm down, and/or expand your chest, this increases the volume inside your lungs.
Boyle's law tells us:.
The existing data on the vacuum effect on biological processes and microbial cells allows to assume that the application of vacuum can be much more extended than currently, bringing new possibilities for the improvement of control strategies and the efficiencies of different processes.
Vacuum is also used in the treatment of soil and groundwater environments for soil dewatering and reduction of pore water pressure, as well as the removal of volatile compounds from soil air.
A vacuum heap biostimulation system was used for the treatment of excavated soil, which is recommended when the timeframe for its treatment is short.
