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Feedback Comments on Matter

by Ron Kurtus

A total of 250 comments and questions have been sent in. They are listed according to date.

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Changing States of Matter Meaning of plasma Sweden
Matter What is String Theory? India
Kinetic Theory of Matter What are degrees of freedom? India
Density What is density? Namibia
Changing States of Matter Don't understand states of matter Malaysia
Kinetic Theory of Matter How to cite a resource? Canada
Atoms Distance between atomic orbits or shells India
Mass and Weight Mass of object on the Moon Indian
Atom as Solar System I believe atoms to be tiny solar systems India
States of Matter Different phases of matter USA

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First 10 letters

Meaning of plasma

Topic: Changing States of Matter


August 26, 2013

1)what is a meaning of the term plasma in matter?
2)explain for me what do you mean when you say the overall charge of a plasma is roughly zero?

ismail - Sweden



Plasmas consist of ionized gases where electrons have been stripped from the atoms or molecules. Temperatures required to create plasmas are usually around several thousand degrees Celsius.

Plasmas do not readily change to other states.

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What is String Theory?

Topic: Matter


May 30, 2013

what is string theory? and which topics study are included in this?

Bhuvneshwar - India



String Theory is a theory that tries to explain matter on a very small scale. Instead of thinking of particles as tiny spheres, String Theory says they are really like vibrating strings.

This theory helps to explain gravity and other forces, as well as some aspects of Quantum Mechanics.

However, it uses complex mathematics and is difficult to visualize. It also doesn't solve all the puzzles about matter and forces.

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What are degrees of freedom?

Topic: Kinetic Theory of Matter


May 28, 2013

What are degrees of freedom? Please explain the translational, rotational and vibrational degrees of freedom using examples of moonatomic, diatomic and triatomic gases?

Aarif - India



A ball of a monatomic gas can move in 3 dimensions: up-down, left-right, and front-back. These are position degrees of freedom.

But a diatomic gas has two atoms connected and can then also rotate and vibrate back-and-forth, resulting in 3 position degrees of freedom, 2 rotational degrees of freedom, 1 vibrational degree of freedom, equaling a total of 6 degrees of freedom.

A triatomic gas has 3, 2, and 4 = 9 degrees of freedom.

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What is density?

Topic: Density


March 25, 2013

what is densty?

nsozi - Namibia



The density of a material is its mass divided by its volume. See the lesson Density of Matter for more information.

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Don't understand states of matter

Topic: Changing States of Matter


March 6, 2013

can you explain me more about this?
I can't really get it.

dhia - Malaysia



Use water as a good example of changing the states of matter of the material.

Water is a liquid. When you cool water to its freezing point, it changes its state to become a solid (ice). When you heat water to its boiling point, it changes its state to become a gas (steam).

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How to cite a resource?

Topic: Kinetic Theory of Matter


November 2, 2012

Hi! My daughter is using some information on your website, specifically on "Kinetic Theory of Matter." Of course, we want to site this source but don't know the publishing organization of this website. Could you please forward this information to me?

Crystal - Canada



A good way to cite the source is simply state: "Kinetic Theory of Matter" by Ron Kurtus; School for Champions

That is typically sufficient credit. Sometimes teachers also want to date of the publication. In this case, it is: 26 November 2011.

Best wishes for success in her assignment.

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Distance between atomic orbits or shells

Topic: Atoms


September 21, 2012

i want to know about the distsnce between the 1s to 2s and so on till where the last k nown shell. and the speed of electron in different energy level.

shiv - India



The distance varies according to the number of protons in the nucleus. For the element Neon, the distance between 1s to 2s is about 0.3 Angstroms or 3*10^-11 m.

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Mass of object on the Moon

Topic: Mass and Weight


August 2, 2012

If the mass of a body is 10kg on earth then what will be the mass of the body on moon

thomas - Indian



Mass is the amount of mater. It is the same on Earth as it is on the Moon.

However, weight is a function of the gravity. The weight on the Moon would be 1/6 of the weight on the Earth.

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I believe atoms to be tiny solar systems

Topic: Atom as Solar System


June 26, 2012

Their are many things around us that we are even unable to see forget abut understanding. At the base everything comes down to Atoms, Photons, Neutrons, string, membrane etc which we can't see.

I believe Atoms to be tiny solar system and our solar system is an atom. I think it's all about dimensions.

Pushan - India



Atoms can be like tiny solar systems and our solar system can be like an atom.

However, some of the rules of physics are different at the very small scale compared with the very large scale. Thus, the properties may be somewhat different between the two "solar systems".

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Different phases of matter

Topic: States of Matter


May 2, 2012

Regular repeating pattern?
Responsible for the different phases of matter (2 words)?
Slow moving liquid?

I have no text book for this 7th grade Science class and I cannot find these answers online anywhere.

Cody - USA



If the regular repeating pattern was moving, it could be a waveform.

Temperature and pressure are responsible for the different phases of matter. See States of Matter.

Oil or grease could be a slow moving liquid.

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