Fundamental interaction

Fundamental interaction is the interaction in nature not reducible to more basic interaction. There have four fundamental interaction in nature. Gravitational force 

 Electromagnetic force 

 Strong nuclear Force 

 Weak nuclear force 

 Gravitational and electromagnetic interaction produces long range effect that is found in our daily life.

 But strong nuclear force and weak nuclear force acts in subatomic level. 

 Each of the fundamental interaction described as field. Gravitational force is attributed to the space time curvature. Other three force can describe by standard model. These three forces are discrete quantum field. According to Standard model, Gluon is a particle that carries strong interaction. Due to strong interaction Quark binding happens and forms hardons, like proton and neutron. Due to residual effect creates nuclear force and binds other particles all together and forms nucleus. Weak interaction is carried by particles called W and Z boson. Weak interaction acts on the nucleus and responsible for radioactive decay. Electromagnetic force is carried by a particle called photon and creates electric field and magnetic field. These electric field and magnetic field interact in small scale within atom. For that reason negatively charged electron and positively charge nucleus attract each other and holds together with a revolving state. Moreover, it is also responsible for chemical bonding and electromagnetic wave, like visible light. But for large scale object like stars , planets there have large astronomical distence. Here no electromagnetic force is effective. Gravitational force holds the planets together.