# Albert Einstein Articles

Wednesday, June 19, 2013

### Acceleration

In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². ...  > full story

### Gravitation

Gravity is a force of attraction that acts between bodies that have mass. Gravity is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not have ...  > full story

### Mechanics

Mechanics can be seen as the prime, and even as the original, discipline of physics. It is a huge body of knowledge about the natural world. It also constitutes a central part of technology. ...  > full story

### General relativity

General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1915. It unifies special relativity and Sir Isaac Newton's law of universal gravitation with the insight that ...  > full story

## Browse Reference Articles

1 to 10 of 385 articles

• ### Electromagnetism

Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, which exerts a force on those particles that possess the property of electric charge, and is in turn ... > more
• ### List of phases of matter

This is a list of the different phases of matter including the more exotic ones. Generally phases of matter are distinguished by the pressure and temperature, transforming into other phases as ... > more
• ### Mass

Mass is a property of a physical object that quantifies the amount of matter it contains. Unlike weight, the mass of something stays the same regardless of location. Mass is a central concept of ... > more
• ### Kinetic energy

Kinetic energy is energy that a body possess as a result of its motion. Kinetic energy as it is mathematically written is the "classic statement" of: Kinetic energy is equal to half the mass of an ... > more
• ### Liquid

A liquid is one of the three ordinary phases of matter. It is a fluid whose shape is usually determined by the container it fills. Its volume is fixed under conditions of constant temperature and ... > more
• ### Physical cosmology

Physical cosmology, as a branch of astrophysics, is the study of the large-scale structure of the universe and is concerned with fundamental questions about its formation and evolution. Cosmology ... > more
• ### Potential energy

Potential energy is stored energy. Potential energy is the energy that exists by virtue of the relative positions (configurations) of the objects within a physical system. This form of energy has the ... > more
• ### Redshift

In physics and astronomy, redshift is an observed increase in the wavelength of electromagnetic radiation received by a detector compared to that emitted by the source. For visible light, red is the ... > more
• ### Subatomic particle

A subatomic particle is a particle smaller than an atom: it may be elementary or composite. Particle physics and nuclear physics concern themselves with the study of these particles, their ... > more
• ### Wave-particle duality

In physics and chemistry, wave-particle duality holds that light and matter exhibit properties of both waves and of particles. A central concept of quantum mechanics, duality addresses the inadequacy ... > more

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### Einstein Rings

Images from the Hubble telescope reveal eight new Einstein rings, joining only three others previously known. Einstein rings are pairs of galaxies,. ...  > full story

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