Questions tagged [heat]
27 questions
16
votes
5 answers
Why does temperature not increase by putting more logs into the fire
Why does temperature not increase by putting more logs into the fire ? It is a very common observation which I have seen but after some research online I found that it is not completely true.
One reason which I think is that if I put more and more…
S.M.T
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Difference between temperature and heat
It is becoming very difficult for me to understand the difference between temperature and heat.
About heat all I have read :
Heat exchange is related to as exchange of matter + energy.
Heat is related as total kinetic energy of molecules.…
S.M.T
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2 answers
Temporary spray adhesive to hold two plates together for drilling?
If two 24in x 6in x 1in thick plates of 6061-T6 aluminum are temporarily bonded together with 3M Super Trim Adhesive (MSDS), would this be a nightmare to separate?
The plate is rated for a max temperature of 572°F (300°C) so I was hoping that a heat…
rdtsc
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2 answers
Does it make sense to increase the thermal "dead weight" of a wood stove?
It is general practice to put a bucket of water on top of a wood stove to keep air humidity under control during the burning of the stove.
But, such a bucket is also bound to keep some more thermal energy captured for a longer time (i.e. absorbed…
Vergilius
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3 answers
Mathematical derivation for 1st law of thermodynamics
Mathematical derivation for 1st law of thermodynamics :
What I know :
1st law of thermodynamics is known as or derived as the conservation of energy . But how are the terms U , q and W derived from it ?
Another way it is derived on internet…
S.M.T
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Can I weld a copper pipe into a CPU heat sink for better cooling?
I have an old laptop which I revived with the addition of a SSD. The problem now with this laptop is that it gets very hot causing thermal shutdowns in the middle of work. I thought of a lot of solutions and finally repasted the heat sink, bought a…
Supragy Mishra
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1 answer
How much a 0.1 mm air gap between 2 materials will affect heat transfer rate?
I have a disc with drilled holes with a 0.1 mm tolerance. The plate is 6061 T6 Aluminum and I want to insert a polyethylene tube with water in it that is frozen. Assuming some tubes are in full contact with the Aluminum and some have a 0.1 mm air…
Jonathan
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Damage to drill through torque?
I've got a Bosch PSB 50 drill, which I'm using to drill through some apparently really tough wood. I don't know why, The drill seems to be struggling, and at times comes to a complete stop. I'm not sure what exactly is happening, maybe the drill…
Mat NX
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1 answer
Why is the carrier block in a winchester rifle made of brass?
In a Winchester 1873, the carrier block is the part that moves a cartridge from the magazine up to the chamber, and that pushes the previously spent shell up out of the top of the rifle. It moves back down and out of the way before the cartridge is…
Bas
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vote
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Why does thermal conductivity of a pipe matter in a double pipe heat exchanger?
My understanding is that thermal conductivity is responsible for the time until something will heat up. For example, if you hold a copper bar over a candle it will quickly become hot at the other end. If you instead hold a brass bar it will take a…
user1477107
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In case of solvation , Who converts gaseous ions to aqueous ? Why do we even have gaseous but not solid ions?
We take Nacl and dissolve it in water. There is formation of $Na^+$ and $Cl^-$ gaseous ions along with 2H+ and $Cl^{2-}$ aqueous ions.
Then , Na+ is attracted towards $Cl^{2-}$ and 2H+ is attracted towards $Cl^-$ ions.
Energy required by water…
S.M.T
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What does it mean by average kinetic energy of molecules as temperature?
We say kinetic of molecules as a function of temperature from the equipartition theorem. This means that more is the velocity or mass of the body , more the is the temperature.
My Q is why does increased motion or mass of molecules contribute to…
S.M.T
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1 answer
Difficulty in understand the meaning of standard enthalpy of formation
Standard enthalpy of formation is when one mole of compound is formed from its constituent elements.
Example : $H_2$(g) + $O_2$(g) —>$ H_2O$(L).
But we don’t say the same for $CaO + CO_2$ —> $CaCO_3$.
It is because $CaCO_3$ is not formed it’s…
S.M.T
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1
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1 answer
What is heat , chemical energy and thermodynamics laws restrictions
Below is a text over which I have my questions which I have written below this text:
Chemical energy stored by molecules can be released as heat during chemical reactions when a fuel like methane, cooking gas or coal burns in air.
The chemical…
S.M.T
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2 answers
Difficulty in understanding the scenario for this Q
Q:If a closed rigid wall container filled with 20 gm of He moving at a constant speed of 10 m/sec is stopped abruptly to stand still, find the increment in temperature of this He sample.
My question regarding this problem :
when kinetic energy…
S.M.T
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