Pressure medium Experiments to this point have been carried out using Fomblin 140/13, Daphne 7373 [19], Fluorinert 70/77, a 4:1 mix of methanol and ethanol [20] or glycerine as the pressure medium. While pressure losses of 0.1-0.3 GPa upon cooling to 4 K are typical for the plastic turnbuckle DACs we find that the actual amount depends on the value of the starting pressure, the pressure medium used and the volume taken up by the sample and its compressibility. Interestingly, a metal version of EC17 increases in pressure almost 20% upon cooling to cryogenic temperatures.
A gear driven load cell was developed for cryogenically loading argon. When cryoloading, one starts with the sample and ruby trapped in the empty gasket and only opens the cell, via the gear drive, to allow liquid in after the cryogens have settled, thus minimizing the chances that the sample will slip out of the hole when the diamonds are apart and the violent action of the cooling liquid can sweep the sample out. After repeated attempts, however, it was found that the diamond epoxy used in the gasket was too brittle to make this a practical means of loading Ar. A device has recently been constructed that makes use of a high pressure intensifier [21] to load gases at room temperature, but it has yet to be tested.

### Language ###
English

### Assessment ###
The text mentions specific pressure losses during cooling, which could be an interesting query target.

### Query ###
What is the typical pressure loss when cooling a pressure cell to 4 Kelvin?
What is the typical pressure loss when cooling a pressure cell to 4 Kelvin?