# Increase temperature of liquid in a box without heat convection or conduction

1. Jul 2, 2015

### fysik

hello
I have a liquid or gas inside a metallic box (eg. stainless steel 5mm thick)
how can I increase its temperature without heat convection or conduction?

2. Jul 2, 2015

### CWatters

Squash the box in a 10 ton press?

3. Jul 2, 2015

### fysik

obviously I don't want to destroy the box

4. Jul 2, 2015

### Staff: Mentor

If you want to increase temperature then you must increase the energy. You can do that by heat or by work. If you can do neither then it cannot be increased.

5. Jul 2, 2015

### CWatters

There are lots of ways to do it but I don't want to waste your time with suggestions that you can't use because of some detail you haven't mentioned.

6. Jul 2, 2015

### bigfooted

Well, he only disallows convection and conduction, not heat transfer in general. You can still use radiation...

7. Jul 2, 2015

### Staff: Mentor

Gases and liquids are not completely transparent, so maybe some kind of radiation will work. To eliminate natural convection, take your box out of a gravitational field.

Chet

8. Jul 2, 2015

### fysik

I don't have any other details, I am looking for ALL possible ways to achieve it

9. Jul 2, 2015

### Staff: Mentor

Your question is pretty vague. Can you tell us what the application is? We could be of more help if we knew the context of the question and the application.

10. Jul 3, 2015

### fysik

there is no application, it's just an experiment

11. Jul 3, 2015

### Staff: Mentor

OK, then the physical principles are that you cannot increase temperature without increasing energy. That can either be done through heat or work. So all possible ways of increasing heat or doing work will achieve it.

12. Jul 3, 2015

### fysik

heat or work...
well work can be anything!
ultrasound?

13. Jul 3, 2015

### Staff: Mentor

Will the radiation transfer energy? Will ultrasound transfer energy? If so, then see my previous post.

14. Jul 3, 2015

### fysik

they may transfer energy
but will they surpass the metallic box?

15. Jul 3, 2015

### Staff: Mentor

How should we know? You provide no details.

You have been taught the physics. Everything else is uninformed speculation on our part. Thread closed.