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Gas and Plasma

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Alyssa Ray

on 15 November 2013

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Transcript of Gas and Plasma

Gas and Plasma
What is Gas?
A substance consisting of widely spread particles; it can expand indefinitely. This is also the third state of matter; it is not a solid or a liquid.
Gases consist of tiny particles widely spaced. Under typical conditions, the average distance between gas particles is about ten times their diameter. Because of these large distances, the volume occupied by the particles themselves is very small compared to the volume of the empty space around them.
http://www.chem.purdue.edu/gchelp/atoms/states.html
A plasma is a distinct state of matter containing a significant number of electrically charged particles, a number sufficient to affect its electrical properties and behavior. In addition to being important in many aspects of our daily lives, plasmas are estimated to constitute more than 99 percent of the visible universe.
What's a Plasma?
an ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures (as in the upper atmosphere and in fluorescent lamps) or at very high temperatures (as in stars and nuclear fusion reactors).Plasma is the fourth state of matter
Plasma Lamp!
When a sample of matter in the
gaseous state is heated, the atoms or molecules gain kinetic energy and move more rapidly. When a sample of gaseous matter is cooled, the atoms or molecules lose kinetic energy and move more slowly. If a sample of gaseous matter, confined to a container of fixed size, is heated, the pressure increases. If the sample is cooled, the pressure drops. If a sample of gaseous matter is placed in a sealed container and then the volume of the container is reduced, the compression heats the gas. If the volume of the sealed container increases, the decompression cools the gas.
Plasma consists of a collection of free moving electrons and ions - atoms that have lost electrons. Energy is needed to strip electrons from atoms to make plasma. The energy can be of various origins: thermal, electrical, or light (ultraviolet light or intense visible light from a laser). With insufficient sustaining power, plasmas recombine into neutral gas.

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container. If not confined to a container, gaseous matter, also known as vapor, will disperse into space . The term gas is also used in reference to the state, or condition, of matter having this property.
There are 7 gases are: oxygen, hydrogen, chlorine, ethane, propane, helium, argon
Inserting Gas Glow Discharge Tubes- Argon and Neon!
Facts about Plasma & Gas!
Plasma is commonly measure in Kelvin or Electron Volts
Plasma is known as the most common phase of ordinary matter in the universe
The sun is the biggest chunk of plasma in the universe
The characteristic properties are: easy to compress, the expand to fill their containers, the occupy more space than liquids or solid from which they form
The expandability of gases causes an odor to fill a room, and it can be assumed that the volume of gas equals the volume of its container.
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