Science: chemistry and physics

Post Reply
User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

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.

International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

User avatar
Brian Peacock
Tipping cows since 1946
Posts: 39811
Joined: Thu Mar 05, 2009 11:44 am
About me: Ablate me:
Location: Location: Location:
Contact:

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:
Rationalia relies on voluntary donations. There is no obligation of course, but if you value this place and want to see it continue please consider making a small donation towards the forum's running costs.
Details on how to do that can be found here.

.

"It isn't necessary to imagine the world ending in fire or ice.
There are two other possibilities: one is paperwork, and the other is nostalgia."

Frank Zappa

"This is how humanity ends; bickering over the irrelevant."
Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
.

User avatar
macdoc
Twitcher
Posts: 8872
Joined: Tue Feb 23, 2010 3:20 pm
Location: BirdWing Home FNQ
Contact:

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.
Resident in Cairns Australia • Current ride> 2014 Honda CB500F • Travel photos https://500px.com/p/macdoc?view=galleries

User avatar
Svartalf
Offensive Grail Keeper
Posts: 40990
Joined: Wed Feb 24, 2010 12:42 pm
Location: Paris France
Contact:

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?
Embrace the Darkness, it needs a hug

PC stands for "Patronizing Cocksucker" Randy Ping

User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

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.
International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

User avatar
Svartalf
Offensive Grail Keeper
Posts: 40990
Joined: Wed Feb 24, 2010 12:42 pm
Location: Paris France
Contact:

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? ;)
Embrace the Darkness, it needs a hug

PC stands for "Patronizing Cocksucker" Randy Ping

User avatar
JimC
The sentimental bloke
Posts: 74076
Joined: Thu Feb 26, 2009 7:58 am
About me: To be serious about gin requires years of dedicated research.
Location: Melbourne, Australia
Contact:

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...
Nurse, where the fuck's my cardigan?
And my gin!

User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

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.
International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

User avatar
JimC
The sentimental bloke
Posts: 74076
Joined: Thu Feb 26, 2009 7:58 am
About me: To be serious about gin requires years of dedicated research.
Location: Melbourne, Australia
Contact:

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.
Nurse, where the fuck's my cardigan?
And my gin!

User avatar
Brian Peacock
Tipping cows since 1946
Posts: 39811
Joined: Thu Mar 05, 2009 11:44 am
About me: Ablate me:
Location: Location: Location:
Contact:

Re: Science: chemistry and physics

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

Rationalia relies on voluntary donations. There is no obligation of course, but if you value this place and want to see it continue please consider making a small donation towards the forum's running costs.
Details on how to do that can be found here.

.

"It isn't necessary to imagine the world ending in fire or ice.
There are two other possibilities: one is paperwork, and the other is nostalgia."

Frank Zappa

"This is how humanity ends; bickering over the irrelevant."
Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
.

User avatar
Brian Peacock
Tipping cows since 1946
Posts: 39811
Joined: Thu Mar 05, 2009 11:44 am
About me: Ablate me:
Location: Location: Location:
Contact:

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.
Rationalia relies on voluntary donations. There is no obligation of course, but if you value this place and want to see it continue please consider making a small donation towards the forum's running costs.
Details on how to do that can be found here.

.

"It isn't necessary to imagine the world ending in fire or ice.
There are two other possibilities: one is paperwork, and the other is nostalgia."

Frank Zappa

"This is how humanity ends; bickering over the irrelevant."
Clinton Huxley » 21 Jun 2012 » 14:10:36 GMT
.

User avatar
JimC
The sentimental bloke
Posts: 74076
Joined: Thu Feb 26, 2009 7:58 am
About me: To be serious about gin requires years of dedicated research.
Location: Melbourne, Australia
Contact:

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...
Nurse, where the fuck's my cardigan?
And my gin!

User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

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."

https://www.techexplorist.com/gravity-f ... pq211wxd5f
International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

Re: Science: chemistry and physics

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

International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

User avatar
Tero
Just saying
Posts: 51069
Joined: Sun Jul 04, 2010 9:50 pm
About me: 15-32-25
Location: USA
Contact:

Re: Science: chemistry and physics

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

International disaster, gonna be a blaster
Gonna rearrange our lives
International disaster, send for the master
Don't wait to see the white of his eyes
International disaster, international disaster
Price of silver droppin' so do yer Christmas shopping
Before you lose the chance to score (Pembroke)

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests