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Feedback Comments on Thermal Energy

by Ron Kurtus

A total of 374 comments and questions have been sent in. They are listed according to date.

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



List of next 10 letters

Topic

Title

Country

Thermal Insulation Is sawdust a better heat insulator than cotton? Malaysia
 
Heat Transfer with Hot Coffee Coffee lid leaks if not put on properly USA
 
Temperature Fixed points for thermometer Namibia
 
Temperature What is the value of absolute zero? India
 
Heat Heating skating rinks Canada
 
Thermal Energy Relationsip between thermal energy and sensible energy? India
 
Thermal Insulation Make a house with a roof that deflects heat UAE
 
Thermal Insulation Why isn't an emitter of visible light white? Bangladesh
 
Heat Holding an ice cube in your hand USA
 
Thermal Insulation Design of 4 stroke diesel engine India
 

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First 10 letters


Is sawdust a better heat insulator than cotton?

Topic: Thermal Insulation

Question

September 15, 2011

Is sawdust a better heat insulator than cotton?

wuilee - Malaysia

21990

Answer

Although sawdust can be an insulator, because wood particles do not transmit heat well, the problem is that the sawdust particles can be closely packed, while cotton fibers have a lot of air between them. For that reason, cotton is usually a better insulator that sawdust.

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Coffee lid leaks if not put on properly

Topic: Heat Transfer with Hot Coffee

Question

June 14, 2011

Thanks for the lesson. I've also noticed that the coffee lid leaks unless you have the lid's hole turned away from the cup's seam. (Possibly the seam acts as an air vent if the barista puts it on without thinking and you don't catch it?) Also, is it my imagination or is the cup more likely to leak if you take the lid off and then put it back on?

Thanks.

S - USA

21717

Answer

That is an interesting observation. If the hole was by the seam, it could cause some coffee to leak out when you drink. Also, the gap could cause some of the hot air in the cup to leak out, cooling the coffee slightly faster.

If you take the lid off and snap it back on, the soft cup material may give a little, and the seal may not be as good as the first time the lid is placed on.

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Fixed points for thermometer

Topic: Temperature

Question

May 23, 2011

Melting ice and boiling water act as two fixed points.Explain how you would use these fixed points to calibrate a thermometer in order to determine the temperature of a hot liquid?

Gehas - Namibia

21616

Answer

See our lesson on Temperature Scales for an explanation.

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What is the value of absolute zero?

Topic: Temperature

Question

May 12, 2011

What is the value of absolute zero?

Dhiraj - India

21569

Answer

Absolute Zero is 0 Kelvin or -273 degrees C.

See Temperature Scales for more information.

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Heating skating rinks

Topic: Heat

Question

April 10, 2011

Information how this is efficent in skating rinks or arenas

mel - Canada

21464

Answer

A problem in arenas is that warm air rises, thus making it difficult to have uniform heat. Unless there is good circulation, heating an arena can be inefficient. In a skating rink, you want the cool air to be near the floor. Also, a skating rink is not heated much.

Infrared heating is often used to heat spectators in skating rinks.

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Relationsip between thermal energy and sensible energy?

Topic: Thermal Energy

Question

March 1, 2011

sir, please tell me , what is the relation between thermal energy and sensible energy?

naveen - India

21274

Answer

Sensible energy or sensible heat has as its sole effect a change of temperature.

This is compared to a latent energy exchanged that is hidden and cannot be observed as a change of temperature. For example, during the melting of ice, the temperature of the system containing the ice and the liquid is constant until all ice has melted.

Thermal energy is the motion of atoms and molecules that results in the change of temperature.

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Make a house with a roof that deflects heat

Topic: Thermal Insulation

Question

February 14, 2011

How can I make house that defect heat from entering the house through the roof? This is a just great six project so please make it simple for me thanks.

Sumayah - UAE

21197

Answer

The sun shining on the roof of a house can be a source of heat within the house. Taking the roof of the house white will reflect much of the sunlight and allow the inside to be cooler. Also, the rules material can insulate the house from the outside temperature.

A shiny metal roof will reflect more sunlight but can also allow heat from the outside air to pass through it.

You can make a model house out of a box and shine a hot lamp on it. Then put a thermometer inside it to measure what type of roof works best.

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Why isn't an emitter of visible light white?

Topic: Thermal Insulation

Question

January 24, 2011

the sun is a black body. it emits all EM waves. so the earth is heated and we see the sun white. a black body emits all EM waves if heated as the case with a lamp black. will we see a lamp black turned into white as it will emit all EM waves including all visible light wave. if a material emits all visible light wave it should look white. Please make me clear.

md.Tanzil - Bangladesh

21070

Answer

when you heat an object, such as metal from a lamp or stove, it will first appear as its natural color, even though you can feel the heat from the object. That heat is infrared radiation. As the object becomes hotter, it will be a dark red color, which is a combination of red visible light and infrared radiation.

As the metal gets hotter, it will change to yellow and finally to what is called a "white hot" color. Note that the sun is not white, but rather it is a bright yellow color. It is a mixture of all colors, but there is more emphasis on the yellow than on some of the other colors.

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Holding an ice cube in your hand

Topic: Heat

Question

January 11, 2011

When holding an ice cube does the thermal energy come from the ice to the hand or the hand to the ice?

- USA

21007

Answer

Your hand is warmer and thus its atoms have greater kinetic or thermal energy than the cold ice cube. Energy transfer wants to average out the energy between the two. Thus energy from your hand will transfer to the ice cube, warming it up.

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Design of 4 stroke diesel engine

Topic: Thermal Insulation

Question

December 2, 2010

1.I would like to know what is the temperature needs to convert water int superheated steam and saturated steam.
2.What parameters involving in design of valve diameters in 4 stroke diesel engine.

MAHENDRAM - India

20783

Answer

Sorry, we do not have that information.

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