I did an experiment on the volume of DEUT at cryogenic temperatures.
DEUT and MERC are well known as elements whose volume changes with temperature.
However, at cryogenic temperatures, it is not easy to measure the volume because the temperature rises with only a small amount of heat.
In order to remove the volume change due to the temperature drop, we enclose the DEUT in DESL (under radical gravity).
The reason for this is that when the DEUT shrinks due to a decrease in temperature, the DESL can enter the gap and preserve the volume of the DEUT even if the temperature increases.
By the way, the volume decreases with decreasing temperature, but in terms of dots, the decrease seems that a single dot insert others into itself.
If it is true, how many dots can be inserted into a single dot at -273.15?
The answer was, roughly speaking, the number of dots between brush size 7 and 8.
(Set 1 dot as brush size 0.)
If we try to obtain the insertion limit more precisely than that, we find that there is a discrepancy between the insertion limits.
When the number of dots is increased from the smaller, and when it is decreased from the larger number, these do not coincide.
(I may have misunderstood something.)

I did this experiment again.
In this experiment, OIL and DEUT were poured into the gap of one dot in the HEAC container and cooled.
This is because the OIL preserves the volume of the compressed DEUT.
Since it is a gap of one dot, it is possible to measure precisely how many dots of DEUT are degenerated in one dot.
The process of pouring 749 dots and cooling down to 0 K is repeated.
The following graph shows the total amount of DEUT poured (dots) on the horizontal axis and the degeneracy density
(how many dots of DEUT are degenerated per dot) on the vertical axis.

https://www.pixiv.net/artworks/96263049

The orange line represents the degeneracy density 3, and the blue line represents the measured data.
This result shows that DEUT can be degenerated up to 3 dots at 0 K.

Using the same method, we replace DEUT with MERC and examine the degeneracy density of MERC,
and obtain the following results, with a degeneracy density of 1.37.

https://www.pixiv.net/artworks/96298662

Rather than examining the degeneracy density of the DUET,
I thought it would be easier to determine the number of degeneracies
by examining the expansion rate, so I examined that.
As a result, we can visibly see the multistage transition
as shown below by submitting DEUT every 50 dots.

https://www.pixiv.net/artworks/96430499

From this result, we can see that the variation of the degenerate density
gradually increases with the total number of particles in the DEUT many-body system.