List of Topics


 

Science Feedback

by Ron Kurtus

Readers have sent in a total of 4977 comments and questions on Science issues. They are listed according to date.

You can read them to further your understanding of the subject.



List of most recent 15 letters

Title

Topic

Country

Why is ozone layer depleting? General Pakistan
 
How we can get rid of pollution? General Pakistan
 
Units of pressure and force Pressure India
 
Water pressure when stones added to a pool Pressure UK
 
Gas pressure on .5 square inch area Pressure Pakistan
 
Applying a torque Force and Torque Myanmar
 
Why does light change its speed? Refraction of Light Pakistan
 
Define refraction Refraction of Light Pakistan
 
How can we cool the Earth? Heat Transfer on Earth USA
 
Why does light separate into colours? Dispersion of Light Pakistan
 
How is physical science related to geology? General Nigeria
 
How does a vacuum in a thermos prevent heat transfer? Heat Transfer Tanzania
 
Need glass that blocks infrared Heating a Greenhouse India
 
Transverse electromagnetic waves EM Waves Philippines
 
Definition of force at a distance Force at Distance USA
 

Next 15 letters

 





General

Why is ozone layer depleting?

September 19, 2017

Question

Why ozone layer is depleting and what can we do to recover it?

Aamish - Pakistan (28240)

Answer

The ozone layer or ozone shield is a region of Earth's upper atmosphere that absorbs most of the Sun's harmful ultraviolet radiation. Unfortunately, some chemical compounds, such as chlorofluorocarbon and Freon, used in air conditioners and refrigerators break down the ozone.

The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.

Slowly over the years, the ozone layer has been recovering.

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General

How we can get rid of pollution?

September 19, 2017

Question

Q.1 How you are contributing in pollution causing agent.
Q.2 How we can get rid of pollution.
Q.3 Why there is much pollution in Pakistan.

Thanks

Aamish - Pakistan (28244)

Answer

Causes of pollution include older automobiles that don't have pollution controls, factories that emit smoke and pollution, and people who burn items with no controls.

Government controls are usually required to reduce polluting automobiles and factories. Education of the public is also necessary to eliminate pollution-causing fires, such as burning trash and even tires.

Many countries--including Pakistan--are struggling with ways to reduce their pollution.

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Pressure

Units of pressure and force

July 13, 2017

Question

Why pressure and force unit is same?

Pratik - India (28131)

Answer

Pressure is force per unit area: P = F/A.

Units are Pascal = Newtons per square meter

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Pressure

Water pressure when stones added to a pool

February 9, 2017

Question

Ron, Thanks for your article. what happens to water pressure if some of the water is removed and replaced by stones. In a pool. I think the water pressure at bottom of pool is reduced.

Kieran - UK (27870)

Answer

Water pressure is caused by the weight of the water above the point of measurement. If the pressure is measured in grams per square cm, it would be the weight of the column of water 1 square cm times the height.

This would be true for water pressure at the top of the stones. Since the distance to the surface is reduced, the water pressure would be less at that point than at the bottom with no stones.

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Pressure

Gas pressure on .5 square inch area

January 13, 2017

Question

what will the gas pressure on .5 square inch area if the pressure is 10 psi in a container of gas.

asif - Pakistan (27801)

Answer

"psi" stands for "pound per square inch". If the area is 0.5 square inch, the pressure would be 5 pounds.

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Force and Torque

Applying a torque

November 7, 2016

Question

Hi,i'm a student sir.
I want to know, what can we do if we know the torque?

Zarni - Myanmar (27475)

Answer

Torque is the rotational force on a shaft. This can be used to turn a wheel or other object or simple machine. If you know the torque being applied, you can calculate how well the force is applied.

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Refraction of Light

Why does light change its speed?

November 6, 2016

Question

Why When light passes from one transparent medium to another it changes its speed and direction?

sadia - Pakistan (27462)

Answer

The speed of light is different in different materials. Often it is related to the density of the material. For example, water is more dense than air and thus is slower in water. This is called the index of refraction and is related to bending at an angle.

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Refraction of Light

Define refraction

November 6, 2016

Question

Can I define refraction

sadia - Pakistan (27463)

Answer

Refraction of light is when it bends when going from one transparent material to another at an angle. When light goes from air to glass at an angle, it bends or refracts.

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Heat Transfer on Earth

How can we cool the Earth?

October 27, 2016

Question

So how can we humans get rid of heat on our planet and cool the earth?

David - USA (27420)

Answer

There really isn't a way for us to cool the Earth, but humans can prevent or slow down global warming, which is caused by the "greenhouse effect" of excess carbon dioxide in the atmosphere.

See Infrared, Gases and the Greenhouse Effect and Heating a Greenhouse for some explanations.

Eliminating burning of carbon-based products would help a lot. However, it is almost impossible to get people to stop using their gasoline-powered automobiles and other such items.

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Dispersion of Light

Why does light separate into colours?

October 3, 2016

Question

Q1 . why white light changes into different light Q1, whith outuse of prism why white light looks white ?and use of prism why white light distrtibute in different colours of light?

hasher - Pakistan (27342)

Answer

The light you see--like from a light bulb--actually consists of all of the colours in the spectrum, but it appears white because your eyes average out all the colours.

But one characteristic of light waves is that the different colours or wavelengths travel at different speeds when moving through glass. For example, red light travels faster in glass than green light, and green light travels faster than blue light. Thus, in a glass prism, the colours separate according to their speed through the glass.

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General

How is physical science related to geology?

July 28, 2016

Question

What are the aspect of physical science related to geology and what are the hints in study physical science

Effiong - Nigeria (27176)

Answer

Physical Science concerns the various sciences that are not related to life. Geology is the study of solid Earth, the rocks of which it is composed, and the processes by which they change. It is sort of the history of the Earth.

A good resource is at Geology.com, which gives information on many aspects of the science.

Best wishes for success in your studies.

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Heat Transfer

How does a vacuum in a thermos prevent heat transfer?

July 19, 2016

Question

Please l need some clarification on
vaccum in themos prevent heat transfer by which way

peter - Tanzania (27155)

Answer

Much of heat or thermal energy is transferred through the vibration of high energy molecules affecting low energy molecules. In other words they heat up the molecules.

But if there is a vacuum, there are no molecules to heat up. The vacuum acts to block the heat transfer.

However, some heat transfer comes from infrared radiation. That is why a thermos usually has a shiny interior, in order to reflect the radiation and eliminate the heat transfer.

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Heating a Greenhouse

Need glass that blocks infrared

July 17, 2016

Question

Hi..
I'm working on project on solar distillator. So I need a glass which transmits the solar radiation into the box, but blocks the infrared to escape out. Do you have any idea about that glass or coatings..?!

Hemant - India (27153)

Answer

Standard window pane glass will work fine. For a background on different materials, see Best Materials for a Greenhouse Roof.

Best wishes for success in your project.

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EM Waves

Transverse electromagnetic waves

July 3, 2016

Question

is transverse wave and transverse electromagnetic wave the same? if not what is a transverse electromagnetic wave? how can you describe it.

fritzie - Philippines (27117)

Answer

The wave motion of an electromagnetic wave is transverse. It is similar to wave motion you can create with a rope, except that the EM wave is in three-dimensions. There are other examples of transverse waves in Overview of Wave Motion.

I hope that helps. Best wishes on your studies.

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Force at Distance

Definition of force at a distance

June 18, 2016

Question

definition of force at a distance?

- USA (27090)

Answer

Most forces require direct contact, but there are some forces that act when the object are separated--even at great distances. A good example is gravitation, where there is a pull from very great distances. Magnetism is also a force at a distance, since the magnets act on each other when separated.

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