# Tag Info

2

A CO$_2$ molecule is more like 0.5nm long and 0.25nm wide, so you're not going to create your holes with a laser or any imminent development of nanolithography. A better bet would be to grow a crystal with pores of the correct size. For example you could probably find a zeolite with a suitable pore size.

0

The atoms are always moving as vibration. The molecules or formula units as such are almost always staying put - the definition of solid. Consider alumina, quartz, diamond. Ionic, mixed, purely covalent. Hard, high melting temps. Single crystal diamond is a single molecule. Look up their crystal structures, their *.cif files. At the bottom of the file ...

1

Strictly speaking (a) is correct. But in cold temperature under the freezing point, the motion would be called "tiny vibration", and molecules cannot move freely as in liquid or gas state. If the "move" in (b) means free motion including replacement with neighboring molecules, (b) may be correct also. But the "move" includes tiny vibration, (b) is wrong. ...

1

From a quantum prespective, it is helpful to categorize the energy of molecules as: electronic vibrational (bending and stretching of bonds) rotational and translational. However, these are each inclusive of potential and kinetic energy.

-1

The Lagrangian $\mathcal L$ and Hamiltonian $\mathcal H$ are mathematical objects that can be used to describe the behaviour of dynamical systems. In classical systems the Lagrangian is the Kenetic energy minus the potential energy, whereas the Hamiltonian is the the Kenetic energy plus the potential energy. Most systems can be fully described by the ...

0

From a kinetic theory of gases perspective, or equilibrium statistical mechanics perspective, potential of ideal gases will strictly be a function of the position of the particles (in fact the relative position of the particles). temperature is just one third of the mean square velocity. For ideal gases, in general $U = f(\bar{r}_1,\bar{r}_2 ... \bar{r}_n)$ ...

1

For an ideal gas there is no potential energy, by definition. For a real gas there is a potential between the molecules, and the average value of the potential energy will have a (very complicated) dependency on temperature.

Top 50 recent answers are included