# Tag Info

1 vote

### Negative Pressures in Van der Waals Equation of State

You can have a stretched liquid to some degree. The same way as pulling a solid body in all directions creates stresses that can have negative trace, you can stretch a liquid, which then holds ...

### Metering Device decreases pressure yet produces saturated liquid?

As you stated: If we reduce the atmospheric pressure (e.g. from 14.7 PSIA to 0.33 PSIA) and if we put the water into a vacuum (e.g. from 29.6 inHg to 0.68 inHg), then we can change the state of the ...
• 1

### Cubic nature of van der Waals' gas equation

The van der Waals equation describes the isotherms of a gas with respect to pressure and volume. The first van der Waals root (the first solution of the cubic equation) will give you the dew point, ...
• 81
Accepted

### Can general purpose compressors be used for a specific gas without modification?

Yes, without further specifics. Assuming you mean a modest size reciprocal type. As commented, there are special consideration for primarily hydrogen or oxygen, and of course if there are specific ...
• 2,942
The half-equations are : $$\ce{Cr -> Cr^{3+} + 3 e-}$$ $$\ce{2 H+ + 2 e- -> H2}$$ So doubling the first and multiplying the second by $3$ and adding the results gives the final equation : \ce{...