Table 1
Main characteristics of the four subsamples from Etna and of the six subsamples from JSC-1A simulant.
| Sample | # | m(g) | Ng | φ±σφ(μm) |  ± (kg/m3) |
 ± (kg/m3) |
Φ1 (%) | Φ2 (%) |
|
|
||||||||
| Etna | 1 | 0.5 | 81 | 36 ± 15 | 1203 ± 26 | 1085 ± 14 | 59 | 63 |
| 2 | 14 | 80 | 115 ± 35 | 1389 ± 53 | 1236 ± 10 | 52 | 58 | |
| 3 | 48 | 84 | 283 ± 67 | 1329 ± 26 | 1190 ± 15 | 54 | 59 | |
| 4 | 64 | 96 | 506 ± 60 | 1349 ± 19 | 1207 ± 13 | 54 | 59 | |
|
|
||||||||
| JSC-1A | 8 | 56 | 91 | 24 ± 9 | 1375 ± 32 | 1285 ± 8 | 53 | 56 |
| 9 | 56 | 93 | 74 ± 28 | 1504 ± 28 | 1395 ± 6 | 48 | 52 | |
| 10 | 10 | 95 | 164 ± 21 | 1395 ± 22 | 1237 ± 22 | 52 | 58 | |
| 11 | 28 | 86 | 248 ± 39 | 1438 ± 15 | 1228 ± 11 | 51 | 58 | |
| 12 | 21 | 90 | 347 ± 43 | 1370 ± 90 | 1166 ± 8 | 53 | 60 | |
| 13 | 9 | 87 | 544 ± 59 | 1236 ± 15 | 1103 ± 27 | 58 | 62 | |
Notes. m is the total available mass, N the number of grains used for dimensional analysis, φ the mean grain size, and σφ its standard deviation. For permittivity measurements between 50 MHz and 6 GHz, (with its standard deviation) and Φ1 are the mean bulk density and the porosity of the subsamples, respectively. For permittivity measurements at 190 GHz, (with its standard deviation) and Φ2 are the mean bulk density and the porosity of the subsamples, respectively.
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