Science: chemistry and physics

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Tero
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Science: chemistry and physics

Post by Tero » Mon Jan 23, 2023 1:22 pm

We did not really have a topic that relates to states of matter. And physics.

I had to look up how heat pumps work. The coolant inside boils at -26C. When it expands in my unit outside, it is able to capture heat from air that is warmer than that. -10C maybe. The compressor then condenses it back to liquid, doing "work" to get this heat transfer going. A refrigerator works the same way. While it cools the insides, it heats the outside air in your kitchen. Start at 1:50



The thermodynamics is the same as the Carnot cycle. That explains the work done in compression and expanding. A mechanical pump.

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Re: Science: chemistry and physics

Post by Brian Peacock » Tue Jan 24, 2023 11:38 am

Still under the misapprehension that chemistry belongs in the same category as science and physics eh? :tea:
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Re: Science: chemistry and physics

Post by macdoc » Tue Jan 24, 2023 12:07 pm

Are you sure you don't mean bio-chemistry.
Chemistry IS a hard science.
The 3 main branches of Natural Sciences are: Physics: the Study of Universe. Chemistry: the Study of Matter. Biology: the Study of Life and Living Organisms.
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Re: Science: chemistry and physics

Post by Svartalf » Tue Jan 24, 2023 3:21 pm

Brian Peacock wrote:
Tue Jan 24, 2023 11:38 am
Still under the misapprehension that chemistry belongs in the same category as science and physics eh? :tea:
Does it not? the chemical properties of the various elements, singly or in combination, are directly derivated from physical laws, neh?
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Re: Science: chemistry and physics

Post by Tero » Tue Jan 24, 2023 4:14 pm

I've had a hard time explaining simple concepts such as heat to seniors. We had the more difficult part in physical chemistry: thermodynamics.
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Re: Science: chemistry and physics

Post by Svartalf » Tue Jan 24, 2023 5:34 pm

heat death, that's what happens to you when you get burned alive, right? ;)
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Re: Science: chemistry and physics

Post by JimC » Tue Jan 24, 2023 8:06 pm

Tero wrote:
Tue Jan 24, 2023 4:14 pm
I've had a hard time explaining simple concepts such as heat to seniors. We had the more difficult part in physical chemistry: thermodynamics.
I used to love teaching some areas of heat in physics. For example, how to calculate the final equilibrium temperature when 2 objects, with different masses, compositions and temperatures are brought together in a sealed container...
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Re: Science: chemistry and physics

Post by Tero » Tue Jan 24, 2023 8:11 pm

We had a software that calculated heats of reaction. When I ran reactions, I would record exothermic reactions and make a chart of how fast the heat came off. however, heats of reaction were never recorded, as that was harder to measure. Only once did I do the "bomb calorimeter" experiment. It burned a piece of paraffin in a sealed container. You put it in a bucket water in styrofoam and recorded the rise.
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Re: Science: chemistry and physics

Post by JimC » Tue Jan 24, 2023 9:03 pm

Tero wrote:
Tue Jan 24, 2023 8:11 pm
We had a software that calculated heats of reaction. When I ran reactions, I would record exothermic reactions and make a chart of how fast the heat came off. however, heats of reaction were never recorded, as that was harder to measure. Only once did I do the "bomb calorimeter" experiment. It burned a piece of paraffin in a sealed container. You put it in a bucket water in styrofoam and recorded the rise.
We had fairly primitive bomb calorimeters at school, and I ran a prac on them. They were pretty inaccurate, but they at least gave students an idea. We also had a similar piece of equipment that would let you calculate the specific heat capacity of a given material.
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Re: Science: chemistry and physics

Post by Brian Peacock » Wed Jan 25, 2023 12:01 am

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Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
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Re: Science: chemistry and physics

Post by Brian Peacock » Wed Jan 25, 2023 12:02 am

macdoc wrote:
Tue Jan 24, 2023 12:07 pm
Are you sure you don't mean bio-chemistry.
Chemistry IS a hard science.
The 3 main branches of Natural Sciences are: Physics: the Study of Universe. Chemistry: the Study of Matter. Biology: the Study of Life and Living Organisms.
Meh. Mix A with B, heat it, and write down what colour it goes, isn't a science.
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"This is how humanity ends; bickering over the irrelevant."
Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
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Re: Science: chemistry and physics

Post by JimC » Wed Jan 25, 2023 12:21 am

Brian Peacock wrote:
Wed Jan 25, 2023 12:02 am
macdoc wrote:
Tue Jan 24, 2023 12:07 pm
Are you sure you don't mean bio-chemistry.
Chemistry IS a hard science.
The 3 main branches of Natural Sciences are: Physics: the Study of Universe. Chemistry: the Study of Matter. Biology: the Study of Life and Living Organisms.
Meh. Mix A with B, heat it, and write down what colour it goes, isn't a science.
School chemistry can indeed be done in a trivial way that might not sound like science, but the incredible complexity of carbon-based molecules (to give just one example), and the techniques used to establish their structure are excellent examples of true science...
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Re: Science: chemistry and physics

Post by Tero » Wed Feb 01, 2023 2:44 pm

Not now gravity in the lab!

"They accomplished this by using sound waves to produce a spherical gravitational field and plasma convection. Gas cools as it approaches a body’s surface and then reheats and rises again as it comes to the core. This process results in a fluid current, producing a magnetic current."

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Said Peter...what you're requesting just isn't my bag
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And our hands they are many and we'd be of one voice
We've come all the way from Wigan to get up and state
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Re: Science: chemistry and physics

Post by Tero » Sat Mar 02, 2024 12:38 pm

https://esapolitics.blogspot.com
http://esabirdsne.blogspot.com/
Said Peter...what you're requesting just isn't my bag
Said Daemon, who's sorry too, but y'see we didn't have no choice
And our hands they are many and we'd be of one voice
We've come all the way from Wigan to get up and state
Our case for survival before it's too late

Turn stone to bread, said Daemon Duncetan
Turn stone to bread right away...

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Re: Science: chemistry and physics

Post by Tero » Sat Mar 02, 2024 12:38 pm

https://esapolitics.blogspot.com
http://esabirdsne.blogspot.com/
Said Peter...what you're requesting just isn't my bag
Said Daemon, who's sorry too, but y'see we didn't have no choice
And our hands they are many and we'd be of one voice
We've come all the way from Wigan to get up and state
Our case for survival before it's too late

Turn stone to bread, said Daemon Duncetan
Turn stone to bread right away...

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