Matter
Name
CO2 snow
Family
Family
solid
Database
Experimentalists
Level
local matter
Origins
laboratory
Provider
IPAG - made from CO2 N45 liquid - Air Liquide
Local reference code
SnowPack CO2
Method
solidification of liquid CO2 droplets by decompression within the SnowPack (R) device providing 312.5 cm3 of CO2 ice in the form of a dense pellet
Phase type
solid
Texture
sintered granular
Type of porosity
porous
Porosity
0.5 ± 0.05
Density
0.78 ± 0.08 g.cm−3
Texture
compact
Grain compacity
0.5 ± 0.05
Grain density
0.78 ± 0.08 g.cm−3
Grain sizes
Grains Size min Size max Size median Size width Size mass fraction Grain shape
#1 40.0 μm 70.0 μm 0.07 ± 0.04 equant
#2 70.0 μm 100.0 μm 0.14 ± 0.07 equant
#3 100.0 μm 130.0 μm 0.18 ± 0.07 equant
#4 130.0 μm 170.0 μm 0.3 ± 0.1 equant
#5 170.0 μm 200.0 μm 0.14 ± 0.07 equant
#6 200.0 μm 230.0 μm 0.07 ± 0.04 irregular
#7 230.0 μm 0.1 ± 0.05 irregular
Size method
binocular photographs
Comments
mean grain size: 150 µm
Number
2
Mode of mixing
homogeneous mixing
Materials
  Name Arrangement Mass (g) Mass fraction Abundance comments
CO2 snow 0.9997 ± 0.0002
H2O ice impurity 0.0003 ± 0.0001 small but strongly variable H2O ice impurity due to water vapor condensation on CO2 snow.
Title
preparation of CO2 snow

Precursors

Matters

Produced matter

Matter
CO2 snow (this matter)
Processing steps
Step Date Type Process Changes
#1 fluid physical solidification of liquid CO2 droplets by decompression from a CO2 bottle (99.995% pure) with plunger within the SnowPack (R) device formation of a dense pellet (312.5 cm3) of CO2 ice
Comments
This matter is a generic matter for all CO2 ices made by this technique
Publications