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Therefore, it is a characteristic of a gas that the molecules are far apart from one another. In addition, thelower the density of the gas the farther apart the molecules must be, since the same number of molecules occupies a larger volume atlower density.

We reinforce this conclusion by noting that liquids and solids are virtually incompressible, whereas gases areeasily compressed. This is easily understood if the molecules in a gas are very far apart from one another, in contrast to the liquidand solid where the molecules are so close as to be in contact with one another.

We add this conclusion to the observations in and that the pressure exerted by a gas depends only on the number of particles in the gas and is independent of the typeof particles in the gas, provided that the density is low enough. This requires that the gas particles be far enough apart. Weconclude that the Ideal Gas Law holds true because there is sufficient distance between the gas particles that the identity ofthe gas particles becomes irrelevant.

Why should this large distance be required? If gas particle A were far enough away from gas particle B that theyexperience no electrical or magnetic interaction, then it would not matter what types of particles A and B were. Nor would it matterwhat the sizes of particles A and B were. Finally, then, we conclude from this reasoning that the validity of the ideal gas lawrests of the presumption that there are no interactions of any type between gas particles.

Postulates of the kinetic molecular theory

We recall at this point our purpose in these observations. Our primary concern in this study is attempting torelate the properties of individual atoms or molecules to the properties of mass quantities of the materials composed of theseatoms or molecules. We now have extensive quantitative observations on some specific properties of gases, and we proceed with the taskof relating these to the particles of these gases.

By taking an atomic molecular view of a gas, we can postulate that the pressure observed is a consequence of thecollisions of the individual particles of the gas with the walls of the container. This presumes that the gas particles are in constantmotion. The pressure is, by definition, the force applied per area, and there can be no other origin for a force on the walls of thecontainer than that provided by the particles themselves. Furthermore, we observe easily that the pressure exerted by the gasis the same in all directions. Therefore, the gas particles must be moving equally in all directions, implying quite plausibly that themotions of the particles are random.

To calculate the force generated by these collisions, we must know something about the motions of the gasparticles so that we know, for example, each particle’s velocity upon impact with the wall. This is too much to ask: thereare perhaps 10 20 particles or more, and following the path of each particle is out of the question. Therefore, we seek a model whichpermits calculation of the pressure without this information.

Questions & Answers

I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, General chemistry ii. OpenStax CNX. Mar 25, 2005 Download for free at http://cnx.org/content/col10262/1.2
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