# The Naked Scientists Forum

### Author Topic: Thermodynamics?  (Read 1527 times)

#### Urza

• Jr. Member
• Posts: 12
##### Thermodynamics?
« on: 23/10/2011 20:46:57 »
-Pretend we have a cube 1cm x 1cm x 1cm of a magical material with a heat capacity, temperature, and thermal conductivity that allows it to release 40gigajoules of heat energy into the surrounding air in the space of a second. (the air was 25oC prior to that one second of intense heat)

-It releases heat primarily by conductivity and convection, it's thermal radiation is minimal.

?!? What would happen to the air around the cube? What kind of temperatures would be measured in the air 1m, 5m, 10m, 50m, and 100m away? How long would it take for the air in a diameter 1m around the cube to return to 25oC?

#### Urza

• Jr. Member
• Posts: 12
##### Thermodynamics?
« Reply #1 on: 23/10/2011 20:56:07 »
-Pretend we have a cube 1cm x 1cm x 1cm of a magical material with a heat capacity, temperature, and thermal conductivity that allows it to release 40gigajoules of heat energy into the surrounding air in the space of a second. (the air was 25oC prior to that one second of intense heat)

-It releases heat primarily by conductivity and convection, it's thermal radiation is minimal.

?!? What would happen to the air around the cube? What kind of temperatures would be measured in the air 1m, 5m, 10m, 50m, and 100m away? How long would it take for the air in a diameter 1m around the cube to return to 25oC?

#### Bored chemist

• Neilep Level Member
• Posts: 8600
• Thanked: 41 times
##### Thermodynamics?
« Reply #2 on: 23/10/2011 22:17:23 »
Why are you asking the same question over and over again?

#### Bored chemist

• Neilep Level Member
• Posts: 8600
• Thanked: 41 times
##### Thermodynamics?
« Reply #3 on: 23/10/2011 22:17:40 »
Why are you asking the same question over and over again?

#### Urza

• Jr. Member
• Posts: 12
##### Thermodynamics?
« Reply #4 on: 24/10/2011 02:39:30 »
Computer error sent the post twice.

#### Geezer

• Neilep Level Member
• Posts: 8328
• "Vive la résistance!"
##### Thermodynamics?
« Reply #5 on: 24/10/2011 02:44:14 »
By an amazing coincidence, it looks as if BC was experiencing a similar problem

#### Bored chemist

• Neilep Level Member
• Posts: 8600
• Thanked: 41 times
##### Thermodynamics?
« Reply #6 on: 24/10/2011 06:53:32 »
Nope, I replied twice because it was the second and third time he asked the same question.

#### Geezer

• Neilep Level Member
• Posts: 8328
• "Vive la résistance!"
##### Thermodynamics?
« Reply #7 on: 24/10/2011 07:21:44 »
Nope, I replied twice because it was the second and third time he asked the same question.

Understood - I was trying to be funny. I merged the two identical topics, and your replies showed up in that order.

#### syhprum

• Neilep Level Member
• Posts: 3772
• Thanked: 16 times
##### Thermodynamics?
« Reply #8 on: 24/10/2011 08:30:45 »
The materiel does not need to be magical an adequate quantity of matter/antimatter could well be confined in a 1 cm cube but the evolution of energy would be much more rapid than 1 second and would consist of gamma radiation as pointed out.
« Last Edit: 24/10/2011 08:54:20 by syhprum »

#### The Naked Scientists Forum

##### Thermodynamics?
« Reply #8 on: 24/10/2011 08:30:45 »