Gas Definition and Examples in Chemistry

A gas is defined as a state of matter consisting of particles that have neither a defined volume nor defined shape. It is one of the four fundamental states of matter, along with solids, liquids, and plasma. Under ordinary conditions, the gas state is between the liquid and plasma states. A gas may consist of atoms of one element (e.g., H2, Ar) or of compounds (e.g., HCl, CO2) or mixtures (e.g., air, natural gas).

Examples of Gases
Whether or not a substance is a gas depends on its temperature and pressure. Examples of gases at standard temperature and pressure include: 카지노사이트

air (a mixture of gases)
chlorine at room temperature and pressure
water vapor or steam
List of the Elemental Gases

There are 11 elemental gases (12 if you count ozone). Five are homonuclear molecules, while six are monatomic:

H2 – hydrogen
N2 – nitrogen
O2 – oxygen (plus O3 is ozone)
F2 – fluorine
Cl2 – chlorine
He – helium
Ne – neon
Ar – argon
Kr – krypton
Xe – xenon
Rn – radon

Except for hydrogen, which is at the top left side of the periodic table, elemental gases are on the right side of the table. 안전한카지노사이트

Properties of Gases
Particles in a gas are widely separated from each other. At low temperature and ordinary pressure, they resemble an “ideal gas” in which the interaction between the particles is negligible and collisions between them are completely elastic. At higher pressures, intermolecular bonds between gas particles have a greater effect on the properties. Because of the space between atoms or molecules, most gases are transparent. A few are faintly colored, such as chlorine and fluorine. Gases tend not to react as much as other states of matter to electric and gravitational fields. Compared with liquids and solids, gases have low viscosity and low density.

Origin of the Word “Gas”
The word “gas” was coined by 17th-century Flemish chemist J.B. van Helmont. There are two theories about the origin of the word. One is that it is Helmont’s phonetic transcription of the Greek word Chaos, with the g in Dutch pronounced like the ch in chaos. Paracelsus’s alchemical use of “chaos” referred to rarified water. The other theory is that van Helmont took the word from geist or gahst, which means spirit or ghost. 카지노사이트 추천

Gas vs Plasma

A gas may contain electrically charged atoms or molecules called ions. In fact, it’s common for regions of a gas to contain random, transient charged regions because of van der Waals forces. Ions of like charge repel each other, while ions of opposite charge attract each other. If the fluid consists entirely of charged particles or if the particles are permanently charged, the state of matter is a plasma rather than a gas.

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