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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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Density Factors Increase in density beneath volcano Ghana
Subatomic Particles Bose–Einstein condensate state of matter India
Kinetic Theory of Matter Behaviour of atoms during evaporation Namibia
Kinetic Theory of Matter Attraction or repulsion between the particles of a gas Nigeria
Density Factors Density of pieces of an object Zambia
Changing States of Matter Wants online lessons from science Zambia
Floating Suggested resources USA
Pressure and States of Matter What is the effect of pressure? Bangladesh
Fluid Pressure Want to move water in a small tube Nigeria
Atom as Solar System Wants proof that Solar System Model is wrong USA

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First 10 letters

Increase in density beneath volcano

Topic: Density Factors


October 2, 2015

what causes an increase in density beneath a recently active volcano?

maud - Ghana



It could be that the molten lava can be compressed, thus increasing the density over solid rock.

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Bose–Einstein condensate state of matter

Topic: Subatomic Particles


September 11, 2015

is bose-einstien latest disscovered state of matter ?
about it on class 12 level and also general

shivansh - India



A Bose–Einstein condensate is a state of matter of a dilute gas of bosons cooled to temperatures very close to absolute zero. A boson is what is called a "force carrier" subatomic particle.

The Bose–Einstein state of matter was discovered in 1995, but it is the most recent new state.

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Behaviour of atoms during evaporation

Topic: Kinetic Theory of Matter


August 12, 2015

what is the behaviour of atoms during the evaporation phase change in terms of kinetic theory?

Wilka - Namibia



Evaporation is when the higher energy atoms escape the body of the liquid. Those atoms have enough kinetic energy to remain in the gas phase. The average energy of those atoms remaining in the liquid drops, because of the loss of high kinetic energy atoms.

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Attraction or repulsion between the particles of a gas

Topic: Kinetic Theory of Matter


August 11, 2015

According to kinetic theory of matter,the force of attraction or repulsion between the particles of a gas are

Timilehin olawumi - Nigeria



Although the collisions between particles are elastic, the attraction or repulsions between particles is very weak.

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Density of pieces of an object

Topic: Density Factors


July 28, 2015

A stone of mass 24g and density 2.5g/cm3 is split into two piece of mass 18g and 6g respectively. What is the density of the smaller piece?
B. 1.3g/cm3
C. 2.5g/cm3
D. 4.0g/cm3

Pharon - Zambia



The density of an object is its mass divided by its volume. If you just divide the object into pieces, each piece would retain the original density. Thus, the smaller piece would have a density of 2.5 (C).

You can find the volume of a piece by dividing its mass by its density. For example, the volume of the 18g piece would be 18/2.5 = 7.2 cm^3.

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Wants online lessons from science

Topic: Changing States of Matter


June 23, 2015

is it possible for me to be having some online lessons from science

Benjamin - Zambia



See the index at Succeed in Understanding Physical Science to access many online lessons and quizzes on the various subjects.

Best wishes for success in your studies.

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Suggested resources

Topic: Floating


June 21, 2015


I wanted to reach out to share some educational pages that help students understand the science behind how heavy objects stay afloat in the water. I’ve collated a number of text and visual resources that explain how the concepts of buoyancy and equilibrium work.

Please take a look here >

I see that you have shared similar information and so I wondered if you would consider citing these resources on this page?
I would like to thank you for your time and consideration and if I have reached you in error, please accept my apologies.

Kind regards

Georgia - USA



Thanks for the resources. I added them to the How Objects Float in Fluids page.

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What is the effect of pressure?

Topic: Pressure and States of Matter


May 29, 2015

What is the effect of pressure on the change of state?

ahnaf - Bangladesh



As stated in Pressure and States of Matter, increased pressure at a given temperature can result in a change of state.

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Want to move water in a small tube

Topic: Fluid Pressure


May 19, 2015

please sir, am working on a project that requires water moving round a small tube. my challenge is how to get the pressure to drive the water, I need an alternative instead of using a compressor.
What other means can water be driven round a tubing arrangemnt.
thanks sir as I wait ur respond. bye

Anthony - Nigeria



I am not exactly sure of the configuration for what you are trying to do.You could have a pump of some sort between the source of your water supply or even within the path. There are a number of different types of devices that can pump or move the water.

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Wants proof that Solar System Model is wrong

Topic: Atom as Solar System


April 23, 2015

I am questioning what proof there is that this theory is incomplete. If I could be given a url or website to look up to see evidence of this study that has disproved this theory that would be greatly appreciated. Thank you

Austin - USA



The Bohr or Solar System Model of the atom is a simple case. A more complex model is seen in Quantum Mechanics. See The Quantum Mechanical Model of the Atom for a resource and explanation.

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