How Exercise Helps Knee Arthritis. Exercising an arthritic knee may seem counterintuitive, but regular exercise can actually lessen â and even relieve â arthritis pain and other symptoms, such as stiffness and swelling. There are several reasons to exercise with knee arthritis. For example: 1  Exercise maintains the jointâs full range of motion.
Beta Software. Before a commercial software program is released to the public, it usually goes through a beta phase. During this stage, the software is tested for bugs, crashes, errors, inconsistencies, and any other problems. Though beta versions of software used to be made available only to developers, they are now sometimes made available for the general public to test, usually through the software company's Web site.
beta particle. an electron emitted from the nucleus of an atom during radioactive decay of the atom. Beta particles have a range of 10 m in air and 1 mm in soft tissue. Also called beta ray. See beta rays.