Gas is one of the four fundamental states of matter. A pure gas may be made up of individual atoms, elemental molecules made from one type of atom, or compound molecules made from a variety of atoms. A gas mixture, such as air, contains a variety of pure gases..
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy. ... The particles exert more force on the interior volume of the container.
xamples of gases are oxygen at room temperature (approximately 20 ºC or 68 ºF), hydrogen at room temperature, and water at standard atmospheric pressure and a temperature above 100 ºC or 212 ºF. When a sample of matter in the gaseous state is heated, the atoms or molecules gain kinetic energy and move more rapidly.
Examples of Gas
  • Hydrogen (H)
  • Nitrogen (N)
  • Oxygen (O)
  • Fluorine (F)
  • Chlorine (Cl)
  • Helium (He)
  • Neon (Ne)
  • Argon (Ar)
  • Examples of Gases
    • Air.
    • Helium.
    • Nitrogen.
    • Freon.
    • Carbon dioxide.
    • Water vapor.
    • Hydrogen.
    • Natural gas.
    • Because most gases are difficult to observe directly, they are described through the use of four physical properties or macroscopic characteristics: pressurevolume, number of particles (chemists group them by moles) and temperature.


Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.
Definition of electricity. 1a : a fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons. b : electric current or power.
Electricity is the presence and flow of electric charge. Using electricity we can transfer energy in ways that allow us to do simple chores. Its best-known form is the flow of electrons through conductors such as copper wires. The word "electricity" is sometimes used to mean "electrical energy".
  • Static Electricity. Static Electricity is nothing but the contact between equal amount of protons and electrons (positively and negatively charged subatomic particles). ...
  • Current Electricity. Current Electricity is a flow of electric charge across an electrical field. ...
  • Hydro Electricity. ...
  • Solar Electricity.


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