Science: chemistry and physics

[Tero]

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.

[Brian Peacock]

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

[macdoc]

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.

[Svartalf]

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

Does it not? the chemical properties of the various elements, singly or in combination, are directly derivated from physical laws, neh?

[Tero]

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

[Svartalf]

heat death, that's what happens to you when you get burned alive, right?

[JimC]

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...

[Tero]

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.

[JimC]

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.

[Brian Peacock]

[Brian Peacock]

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.

[JimC]

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...

[Tero]

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."

https://www.techexplorist.com/gravity-f ... pq211wxd5f

[Tero]

[Tero]

Leonard Susskind interview
https://youtu.be/s78hvV3QLUE?si=DwFDIdt9Y1YUXt4A