Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!
Is it possible to make a perfect vacuum?
Asked by: Dan Klingensmith
Practically, it is impossible to make a perfect vacuum. A perfect vacuum is defined as a region in space without any particles.
The problem is that to maintain a vacuum in a region you have to shield it from the environment. It is not difficult to make a container that would prevent atoms from entering the region.
The first problem is that the container itself will radiate photons (which in turn can create electron positron pairs in the vacuum) if it is not kept at a temperature of 0°K. Note that a perfect vacuum has by definition a temperature of 0°K. reaching 0 °K is practically impossible.
The second problem is that there are weakly interacting particles that could enter the region. No matter how thick the walls of the container are, there is always a finite probability that, say, a neutrino would enter the region.
Answered by: Saibal Mitra, M.S., Physics Grad Student, UVA Amsterdam
Here are our physics & astronomy bestsellers:
Magnetic Levitator - Classic
Revolving Multi-Color Fiberoptic Light
Scorpion, Ant, Wasp and Flower Bug
12 inch Galileo Thermometer
Enviro Battery 4M Kit
Wood Grain Newtons Cradle
Brush Robot 4M Kit
Tin Can Robot 4M Kit
Electric Plane Launcher 4M Kit