Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Gas shopping experience:
1. Compare - without doubt the biggest advantage that the Gas offers shoppers today is the ability to compare thousands of Gas at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Gas? Wrong! If the Gas is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Gas then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Gas? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Gas and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Gas wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Gas then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Gas site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Gas, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Gas, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
Gas can also refer to gasoline and natural gasand also hydrogen. For other uses, see gas (disambiguation).
, molecules, or
ions.)
Gas is one of the four major
states of matter, consisting of freely moving atoms or molecules without a definite shape. Compared to the
solid and
liquid states of matter a gas has lower
density and a lower
viscosity. The
volume of a gas will change with changes in
temperature or pressure, as described by the
ideal gas law. A gas also has the characteristic that it will
diffuse readily, spreading apart in order to uniformly fill the space of any container.
Physics
In a gas phase the
atoms or
molecules constituting the matter basically move independently, (more freely than those in a solid or liquid) with no forces keeping them together or pushing them apart. Their only
interactions are rare and
random collisions. The particles move in random directions, at high speed. The range in speed is dependent on the temperature and defined by the Maxwell-Boltzmann distribution. Therefore, the gas phase is a completely Randomness state. Following the second law of thermodynamics, when no
work (physics) is being done on or by a gas, the gas particles will immediately diffusion to homogeneously fill any shape or volume of space that is made available to them.
The thermodynamic state of a gas is characterized by its
volume, its temperature, and its pressure. These variables are related by the fundamental
gas laws, which state that the pressure in an
ideal gas is proportional to its temperature and number of molecules, but inversely proportional to its volume.
Like liquids and Plasma (physics), gases are flowing and free moving fluids: they have the ability to flow and do not tend to return to their former configuration after deformation, although they do have viscosity. Unlike liquids, unconstrained gases in a
vacuum environment do not occupy a fixed volume, but expand to fill the entire space. Note that this is true in the case of empty, vacuum environments. If one sprays
carbon dioxide from a
fire extinguisher, for example, the gas will not expand to fill the room. Instead, the gas will pour out like a fluid and pool on the floor. This is due to the fact that it is denser than the air surrounding it.Beatty, William J. " Recurring science misconceptions in K-6 textbooks". Retrieved 2007-06-08.
The kinetic energy per molecule in a gas is the second greatest of the states of matter (after Plasma physics). Because of this high kinetic energy, gas atoms and molecules tend to bounce off of any containing surface and off one another, the more powerfully as the kinetic energy is increased. A common misconception is that the collisions of the molecules with each other is essential to explain gas pressure, but in fact their random velocities are sufficient to define that quantity. Mutual collisions are important only for establishing the Maxwell-Boltzmann distribution.
Gas particles are normally well separated, as opposed to liquid particles, which are in contact. A material particle (say a dust mote) in a gas substrate moves in Brownian Motion. Since it is at the limit of (or beyond) current technology to observe individual gas particles (atoms or molecules), only theoretical calculations give suggestions as to how they move, but their motion is different from Brownian Motion. The reason is that Brownian Motion involves a smooth drag due to the frictional force of many gas molecules, punctuated by violent collisions of an individual (or several) gas molecule(s) with the particle. The particle (generally consisting of millions or billions of atoms) thus moves in a jagged course, yet not so jagged as we would expect to find if we could examine an individual gas molecule.
Some types of gases
- Ideal gas, in physics, chemistry, and thermodynamics
- Various hydrocarbon gases used for heating, lighting, and energy transmission:
- Natural gas
- Liquefied Petroleum Gas (LPG), including propane and butane
- Syngas: various synthetic fuel gases: names include coal gas, water gas, illuminating gas, wood gas, producer gas, holzgas, air gas, blue gas, manufactured gas, town gas, hygas
- Gas (chemical warfare), various poison gases used in warfare
- Inhalational anaesthetic, including nitrous oxide or laughing gas.
- Trace gas
- Toxic gases
- Noble gases
Etymology
The word "gas" was apparently proposed by the 17th century
Flanders chemist Jan Baptist van Helmont, as a phonetic spelling of his
Dutch language pronunciation of the
Greek language word "
chaos", which was used since 1538 after Paracelsus for "air". http://www.etymonline.com/index.php?term=gas
See also
References
Gas can also refer to gasoline and natural gasand also hydrogen. For other uses, see gas (disambiguation).
, molecules, or ions.)
Gas is one of the four major
states of matter, consisting of freely moving atoms or
molecules without a definite shape. Compared to the solid and liquid states of matter a gas has lower density and a lower viscosity. The volume of a gas will change with changes in
temperature or
pressure, as described by the
ideal gas law. A gas also has the characteristic that it will diffuse readily, spreading apart in order to uniformly fill the space of any container.
Physics
In a gas phase the
atoms or
molecules constituting the matter basically move independently, (more freely than those in a solid or liquid) with no forces keeping them together or pushing them apart. Their only interactions are rare and random collisions. The particles move in random directions, at high speed. The range in speed is dependent on the temperature and defined by the Maxwell-Boltzmann distribution. Therefore, the gas phase is a completely Randomness state. Following the second law of thermodynamics, when no work (physics) is being done on or by a gas, the gas particles will immediately
diffusion to homogeneously fill any shape or volume of space that is made available to them.
The
thermodynamic state of a gas is characterized by its volume, its temperature, and its
pressure. These variables are related by the fundamental
gas laws, which state that the pressure in an ideal gas is proportional to its temperature and number of molecules, but inversely proportional to its volume.
Like liquids and Plasma (physics), gases are flowing and free moving fluids: they have the ability to flow and do not tend to return to their former configuration after deformation, although they do have viscosity. Unlike liquids, unconstrained gases in a vacuum environment do not occupy a fixed volume, but expand to fill the entire space. Note that this is true in the case of empty, vacuum environments. If one sprays
carbon dioxide from a
fire extinguisher, for example, the gas will not expand to fill the room. Instead, the gas will pour out like a fluid and pool on the floor. This is due to the fact that it is denser than the air surrounding it.Beatty, William J. " Recurring science misconceptions in K-6 textbooks". Retrieved 2007-06-08.
The kinetic energy per molecule in a gas is the second greatest of the states of matter (after
Plasma physics). Because of this high kinetic energy, gas atoms and molecules tend to bounce off of any containing surface and off one another, the more powerfully as the kinetic energy is increased. A common misconception is that the collisions of the molecules with each other is essential to explain gas pressure, but in fact their random velocities are sufficient to define that quantity. Mutual collisions are important only for establishing the Maxwell-Boltzmann distribution.
Gas particles are normally well separated, as opposed to liquid particles, which are in contact. A material particle (say a dust mote) in a gas substrate moves in Brownian Motion. Since it is at the limit of (or beyond) current technology to observe individual gas particles (atoms or molecules), only theoretical calculations give suggestions as to how they move, but their motion is different from Brownian Motion. The reason is that Brownian Motion involves a smooth drag due to the frictional force of many gas molecules, punctuated by violent collisions of an individual (or several) gas molecule(s) with the particle. The particle (generally consisting of millions or billions of atoms) thus moves in a jagged course, yet not so jagged as we would expect to find if we could examine an individual gas molecule.
Some types of gases
- Ideal gas, in physics, chemistry, and thermodynamics
- Various hydrocarbon gases used for heating, lighting, and energy transmission:
- Natural gas
- Liquefied Petroleum Gas (LPG), including propane and butane
- Syngas: various synthetic fuel gases: names include coal gas, water gas, illuminating gas, wood gas, producer gas, holzgas, air gas, blue gas, manufactured gas, town gas, hygas
- Gas (chemical warfare), various poison gases used in warfare
- Inhalational anaesthetic, including nitrous oxide or laughing gas.
- Trace gas
- Toxic gases
- Noble gases
Etymology
The word "gas" was apparently proposed by the 17th century
Flanders chemist
Jan Baptist van Helmont, as a phonetic spelling of his Dutch language pronunciation of the
Greek language word "
chaos", which was used since 1538 after Paracelsus for "air". http://www.etymonline.com/index.php?term=gas
See also
References
Gas
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