Browse Definitions :
Definition

antimatter

Antimatter is any substance that, when combined with an equal amount of matter, results in the complete and direct conversion of all substance to energy. Antimatter is composed of antiparticles. Each particle of matter has a corresponding antiparticle of antimatter.

The antiparticle of an electron is known as a positron. It has the same mass as an electron, but opposite electric charge (positive rather than negative). The antiparticle of the proton is called an antiproton. It has the same mass as a proton, but opposite charge (negative rather than positive). The antiparticle of the neutron is an antineutron. It has the same mass as a neutron, and, like the neutron, has no electric charge. However, the relationship between two properties called spin and magnetic moment is different in the antineutron than in the neutron.

Antiparticles have been found in cosmic rays, and are also produced in particle accelerators (also known as atom smashers). An antiparticle never lasts for very long, because shortly after it forms, it encounters one of its equivalent matter particles, and both are annihilated, yielding pure energy.

Artificially produced antimatter has practical applications, especially in medical science, where it is involved in the operation of positron emission tomography (PET) scanning equipment. Antimatter has been suggested as a possible propellant for spacecraft, a source of energy for public consumption, and as material for a doomsday bomb that would vaporize the earth. However, all these potential applications require the isolation of large amounts of antimatter, and the technology for this does not yet exist.

This was last updated in March 2010

Continue Reading About antimatter

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

SearchCompliance

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

  • PCI DSS (Payment Card Industry Data Security Standard)

    The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

SearchSecurity

SearchHealthIT

SearchDisasterRecovery

  • call tree

    A call tree is a layered hierarchical communication model that is used to notify specific individuals of an event and coordinate ...

  • Disaster Recovery as a Service (DRaaS)

    Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...

  • cloud disaster recovery (cloud DR)

    Cloud disaster recovery (cloud DR) is a combination of strategies and services intended to back up data, applications and other ...

SearchStorage

Close