Cooking Gas Containers: Temp Impact of Motion

In summary, the temperature of the gas molecules inside cooking gas containers will stay the same when the containers are kept in a lorry moving with uniform speed. This is because temperature is proportional to the average kinetic energy of the molecules with respect to the center of mass, and the increase in KE with respect to a fixed point on the ground is irrelevant to temperature. Even if the lorry were accelerating, the temperature would not change because the KE of the center of mass is not included in the calculation of temperature.
  • #1
erisedk
374
7

Homework Statement


Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside the containers will increase, decrease or stay the same?

Homework Equations


T is proportional to KE of gas molecules.

The Attempt at a Solution


I thought it would increase, because the average KE of the gas molecules would increase. But the answer says stays the same.
 
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  • #2
Hi erisedk:

I think you forgot that temperature is a measure of the average kinetic energy (KE) with respect to the center of mass of the material. Although the KE is increased with respect to a fixed point on the ground, that increase is irrelevant to temperature.

Regards,
Buzz
 
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Likes erisedk
  • #3
Thank you, I definitely don't think I even knew that. If the car were accelerating, would the temperature still not change because the increase in velocity would occur for the centre of mass as well?
 
  • #4
erisedk said:
If the car were accelerating, would the temperature still not change because the increase in velocity would occur for the centre of mass as well?
Hi erisedk:

Temperature does not include the KE of the center of mass (COM). It is the proportional to the average of the KE of the particles relative to the COM. That is, for each particle its
KE = 1/2 mv2
where v is the velocity of the particle relative to the systems COM.

Regards,
Buzz
 
  • #5
Oh yeah, I got that. So even if it were accelerating, no change in temperature right?
 
  • #6
Hi erisedk:

Right.

Regards,
Buzz
 
  • #7
Thank you :)
 
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Likes Buzz Bloom

1. How does motion affect the temperature of cooking gas containers?

Motion can have a significant impact on the temperature of cooking gas containers. When the containers are in motion, the gas molecules inside collide with each other more frequently, causing an increase in temperature. This is known as the "Joule-Thomson effect".

2. Can motion cause cooking gas containers to explode?

It is highly unlikely for cooking gas containers to explode due to motion alone. However, if the containers are exposed to extremely high temperatures, the pressure inside the containers may increase, potentially causing an explosion.

3. How should cooking gas containers be stored to minimize the impact of motion?

Cooking gas containers should be stored in a cool, dry place and secured in an upright position to minimize the impact of motion. This will help to maintain a consistent temperature and prevent any potential accidents.

4. Is it safe to transport cooking gas containers while they are in use?

No, it is not safe to transport cooking gas containers while they are in use. The containers should be turned off and allowed to cool down before being transported to prevent any potential hazards.

5. Can the temperature of cooking gas containers in motion be measured?

Yes, the temperature of cooking gas containers in motion can be measured using a thermometer or a thermal imaging camera. This can help to ensure that the containers are not exposed to extreme temperatures and are safe to use.

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