What is supercooled liquid helium
Liquid helium (4.2 K) sealed and then raised to a temperature below LOX (~ 70 K) - what is the new pressure?
We don't have to look at the phase diagram here, as it doesn't matter which way we get to a particular endpoint. We can assume that we heat the helium at constant pressure and then reduce its volume again.
The density of the liquid helium boiling at 1 atm pressure is 0.125 g / cm3. The density of gaseous helium at 273 K is 0.18 mg / cm3. Therefore it has 700 times the volume or, if the volume is limited, a pressure of 700 bar. At a temperature of LOX, ie 70 K, we can treat helium as a perfect gas which, as a first approximation, behaves according to the ideal gas law. That is, pV./T.=const. So pressure will be a factor T.Lox / 273K = 0.26 lower. A volume of liquid helium that is sealed and heated to 70 K has a pressure of 180 bar.
This only applies if we can assume that helium still behaves like an ideal gas even at a pressure of 18 MPa. This deviation can be found in the compressibility factor and was measured (see e.g. SW Van Sciver, Helium Cryogenics, Appendix 1). This factor is around 1.2 to 1.3 under our conditions, so the actual pressure is around 230 bar.
- An example of a business item
- How do you learn so much
- Is Egypt in Asia or Africa
- Can detect Malwarebytes rootkits
- How can you find what drives them
- What technology is used in WiFi
- What should everyone know about California
- Working with others helps with self-esteem
- How will climate change affect Los Angeles?
- Who do Americans bribe
- Are insurance companies useless
- Portugal is warm all year round
- Why is C so widely used in finance
- What are bridesmaid gift options
- What is application programming interface pdf
- Most of the old societies were totalitarian
- What is brutalist graphic design
- Why is sports betting bad
- What is the XeOF4 Lewis structure
- How do I test the usability of the app
- Where did you learn UX design
- How can I get better in German?
- What is the future of psychiatry
- What is a Good Introduction to Artificial Intelligence