词条 | Typical resistivities |
释义 | Typical resistivities Table Typical resistivities material resistivity (ohm-centimetre) seawater (18 °C) 21 uncontaminated surface water 2(104) distilled water 0.2–1(106) water (4 °C) 9(106) ice 3(108) Rocks (in situ) sedimentary clay, soft shale 100–5(103) hard shale 7–50(103) sand 5–40(103) sandstone (104)–(105) glacial moraine 1–500(103) porous limestone 1–30(104) dense limestone \\>(106) rock salt (108)–(109) igneous 5(104)–(108) metamorphic 5(104)–5(109) Rocks (laboratory) dry granite 1012 Minerals copper (18 °C) 1.7(10−6) graphite 5–500(10−4) pyrrhotite 0.1–0.6 magnetite crystals 0.6–0.8 pyrite ore 1–(105) magnetite ore (102)–5(105) chromite ore \\>106 quartz (18 °C) (1014)–(1016) See as table: |
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