Question: Electromagnetic Force is one of how many other interactions in nature?
About the article "Electromagnetism", section "Abstract".

Candidate passages:
Electromagnetism, or the electromagnetic force is one of the four fundamental interactions in nature, the other three being the strong interaction, the weak interaction, and gravitation.
This force is described by electromagnetic fields, and has innumerable physical instances including the interaction of electrically charged particles and the interaction of uncharged magnetic force fields with electrical conductors.
The word "electromagnetism" is a compound form of two Greek terms, ἢλεκτρον, "ēlektron", "amber", and μαγνήτης, "magnetic", from "magnítis líthos" (μαγνήτης λίθος), which means "magnesian stone", a type of iron ore.
The science of electromagnetic phenomena is defined in terms of the electromagnetic force, sometimes called the Lorentz force, which includes both electricity and magnetism as elements of one phenomenon.
During the quark epoch, the electroweak force split into the electromagnetic and weak force.
The electromagnetic force plays a major role in determining the internal properties of most objects encountered in daily life.
Ordinary matter takes its form as a result of intermolecular forces between individual molecules in matter.
Electrons are bound by electromagnetic wave mechanics into orbitals around atomic nuclei to form atoms, which are the building blocks of molecules.
This governs the processes involved in chemistry, which arise from interactions between the electrons of neighboring atoms, which are in turn determined by the interaction between electromagnetic force and the momentum of the electrons.
There are numerous mathematical descriptions of the electromagnetic field.
In classical electrodynamics, electric fields are described as electric potential and electric current in Ohm's law, magnetic fields are associated with electromagnetic induction and magnetism, and Maxwell's equations describe how electric and magnetic fields are generated and altered by each other and by charges and currents.
The theoretical implications of electromagnetism, in particular the establishment of the speed of light based on properties of the "medium" of propagation (permeability and permittivity), led to the development of special relativity by Albert Einstein in 1905.
In physics, a fundamental interaction or fundamental force is a process by which elementary particles interact with each other.
An interaction is often described as a physical field, and is mediated by the exchange of gauge bosons between particles.
For example, the interaction of charged particles takes place through the mediation of electromagnetic fields, whereas beta decay occurs by means of the weak interaction.
An interaction is fundamental when it cannot be described in terms of other interactions.
There are four known fundamental interactions in Nature: The electromagnetic, strong, weak, and gravitational interactions.
The weak and electromagnetic interactions are unified in electroweak theory, which is unified with the strong force in the standard model. 
  Electromagnetic force, one of the four fundamental forces of nature  Electromagnetic theory, the scientific study of electromagnetism, including Maxwell's equations.
This is also called electromagnetics  Electromagnetic radiation  Electromagnetic waves, the propagation model for electromagnetic radiation  Electromagnetic energy  Electromagnetic spectrum  Electromagnetic field  
The electromagnetic force is one of the four known fundamental forces.
The other fundamental forces are:  the weak nuclear force, which binds to all known particles in the Standard Model, and causes certain forms of radioactive decay.
(In particle physics though, the electroweak interaction is the unified description of two of the four known fundamental interactions of nature: electromagnetism and the weak interaction);  the strong nuclear force, which binds quarks to form nucleons, and binds nucleons to form nuclei  the gravitational force.
All other forces (e.g., friction) are ultimately derived from these fundamental forces and momentum carried by the movement of particles.
The electromagnetic force is the one responsible for practically all the phenomena one encounters in daily life above the nuclear scale, with the exception of gravity.
Roughly speaking, all the forces involved in interactions between atoms can be explained by the electromagnetic force acting on the electrically charged atomic nuclei and electrons inside and around the atoms, together with how these particles carry momentum by their movement.
This includes the forces we experience in "pushing" or "pulling" ordinary material objects, which come from the intermolecular forces between the individual molecules in our bodies and those in the objects.
It also includes all forms of chemical phenomena.
A necessary part of understanding the intra-atomic to intermolecular forces is the effective force generated by the momentum of the electrons' movement, and that electrons move between interacting atoms, carrying momentum with them.
As a collection of electrons becomes more confined, their minimum momentum necessarily increases due to the Pauli exclusion principle.
The behaviour of matter at the molecular scale including its density is determined by the balance between the electromagnetic force and the force generated by the exchange of momentum carried by the electrons themselves. 
In particle physics, forces between particles arise from the exchange of other particles.
These "force carrier particles" are bundles of energy (quanta) of a particular kind of field.
There is one kind of field for every species of elementary particle.
For instance, there is an electron field whose quanta are electrons, and an electromagnetic field whose quanta are photons.
The force carrier particles that mediate the electromagnetic, weak and strong interactions are called gauge bosons.