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Type ID # of Properties # of Instances Description
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Describe any person, place, or concept. This is the most common type in Freebase and is used to describe an is a relationship between topics (eg. San Francisco undefined city)

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Fundamental interaction /physics/fundamental_interaction 1 4

In physics, fundamental interactions (sometimes called fundamental forces) are the ways that the simplest particles in the universe interact with one other. An interaction is fundamental when it cannot be described in terms of other interactions. (From the Wikipedia page on Fundamental interaction.)

enumerated
Hadron /physics/hadron 1 13

A subatomic particle consisting of two or three quarks.

Subatomic particle /physics/particle 8 38

A microscopically small unit of matter or energy. The properties of this type are some of those found in Wikipedia here (http://en.wikipedia.org/wiki/Template:Infobox_Particle/doc).

Subatomic particle family /physics/particle_family 3 9

A group of subatomic particles which share the same quantum properties.

enumerated
Quark /physics/quark 1 12

A quark is an elementary particle. Quarks combine together to form hadrons (such as protons and neutrons).

Subatomic particle generation /physics/subatomic_particle_generation 1 3

A group of fundamental particles; between generations, particles differ only by their mass.

enumerated
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What are Mediators? Mediators

Type ID # of Properties # of Instances Description
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Describe the relationship between two or more Types. For example, the film performance Mediator in Film describes the relationship between a movie, an actor, and a character. We use film performance to assert that Heath Ledger played the character of The Joker in the film The Dark Knight.

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Magnetic moment /physics/magnetic_moment 2 1

The magnetic moment, including its uncertainty, of a subatomic particle in units of Bohr magneton.

Particle-Antiparticle /physics/particle_antiparticle 2 22

This type is used to hold a particle-antiparticle pair.

Subatomic mass /physics/subatomic_mass 2 5

The mass of a subatomic particle, including its uncertainty, in units of MeV/c².

Subatomic particle composition /physics/subatomic_particle_composition 3 23

A CVT which denotes the number of one type of fundamental particle which make up a compound subatomic particle.

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