Outer space has very low density and pressure, and is the closest physical approximation of a perfect vacuum.
Ultimately, a perfect vacuum isn't possible because quantum theory dictates that energy fluctuations known as 'virtual particles' are constantly popping in and out of existence, even in 'empty' space. Read more: How can something explode in the vacuum of space?
Answer. Practically, it is impossible to make a perfect vacuum. A perfect vacuum is defined as a region in space without any particles.
Condition of p = 0 Pa is called the perfect vacuum or absolute zero pressure.
Outer space is not completely empty; it is a near-perfect vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays.
Space is usually regarded as being completely empty. But this is not true. The vast gaps between the stars and planets are filled with huge amounts of thinly spread gas and dust. Even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic metre.
It is therefore called a black hole, and its surface is called the "event horizon." But contrary to popular myth, a black hole is not a cosmic vacuum cleaner. If our Sun was suddenly replaced with a black hole of the same mass, Earth's orbit around the Sun would be unchanged.
The ultimate vacuum, defined as the lowest pressure that can be produced and measured reproducibly in a vacuum system at room temperature, has decreased by a factor of about 10 since the first measurement of sub-atmospheric pressure by Robert Boyle in about 1660.
The maximum vacuum that can be achieved in locations above sea level will be less than 29.92-in. -Hg. The force will be limited by the ambient atmospheric pressure. Vacuum pumps have maximum vacuum ratings based on sea level conditions and must be re-rated for operation at higher elevations.
Black & Decker's mini-vac – the DustBuster – was introduced to American consumers in 1979, but the company developed most of the inner workings for the device as the result of a partnership with NASA for the Apollo moon landings between 1963 and 1972.
—Why does outer space look black? "No human can survive this — death is likely in less than two minutes," Lehnhardt said. According to NASA's bioastronautics data book, the vacuum of space would also pull air out of your lungs, causing you to suffocate within minutes.
Use a vacuum
You can suck flies straight out of the air by hovering a few inches behind with a regular vacuum on to pull them in. Use this method only with vacuum cleaners that have a bag, and dispose of it immediately after loading it up with pests so they can't find their way back into your home.
Another option is that the universe is, in some sense, in a temporary state and what we think of as reality is what is called a false vacuum. A false vacuum occurs when a field has two “ground” states, one higher than the other. You can think of the false vacuum as being like a valley.
If we had a container at a theoretical perfect vacuum (that is, we have removed every molecule and its components from within the vessel) then we could state that vacuum condition as 0 (zero) pressure absolute or 0 PSIA.
Any negative pressure significantly below standard atmospheric pressure (760 Torr/mmHg, 29.9 inHg or 14.7 PSI) is considered a vacuum.
One micron equals 1/25,400 of 1 inch; 25,400 microns equal 1 inch. So using this vacuum scale, 759,968 (760,000) microns represents atmospheric pressure, and 0 microns represent a perfect vacuum.
Without air in your lungs, blood will stop sending oxygen to your brain. You'll pass out after about 15 seconds. 90 seconds after exposure, you'll die from asphyxiation. It's also very cold in space.
A high quality vacuum pump will be able to take you down to 200-500 microns. With the system almost completely free from water vapor, you are ready to put the refrigerant back in the system. A thorough approach to evacuation ensures longer equipment life and reduced risk of problems.
No, absolute pressure is measured with reference to a perfect vacuum so it is impossible for it to go negative. You can only measure negative pressure between two different pressures.
Ultrahigh vacuum (UHV) is defined as the pressure range between 10-6 Pa (in Europe) or 10-7 Pa (in the USA) and 10-10 Pa; extreme high vacuum (XHV) is defined as the range of pressure below 10-10 Pa (7.5 × 10-13 Torr or 10-12 mbar).
The vacuum of outer space is not caused by the expansion of the universe, but is caused by gravity. First of all, when we say outer space (the space outside the atmosphere of planets and stars) is a "vacuum" or is "empty", we really mean that outer space is nearly empty or almost a perfect vacuum.
The maximum strength of vacuum at see level is about -15 psi. A related phenomenon that could help you better understand the limit of vacuum is: what is the loudest sinusoidal wave possible at see level? The answer turns out to be about 194 db.
Is it possible for a black hole to "eat" an entire galaxy? No. There is no way a black hole would eat an entire galaxy. The gravitational reach of supermassive black holes contained in the middle of galaxies is large, but not nearly large enough for eating the whole galaxy.
Nothing, not even light itself can escape a black hole. That includes all your magnificent explosion energy from your antimatter impact. You wouldn't even see it happen. You'd just end up with a black hole with twice the mass.
A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes.