pumice - significado y definición. Qué es pumice
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Qué (quién) es pumice - definición

LIGHT COLOURED HIGHLY VESICULAR VOLCANIC ROCK
Pumicite; Pumice stones; Pumice stone; Pumic stone; Reticulite; Pumice concrete
  • Pumice soap bars
  • Bar of solid pumice stone
  • centimeters]].

Pumice         
·noun A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, ·esp. in the form of powder, for smoothing and polishing. Called also pumice stone.
pumice         
Pumice is a kind of grey stone from a volcano and is very light in weight. It can be rubbed over surfaces, especially your skin, that you want to clean or make smoother.
= pumice stone
N-UNCOUNT
pumice         
['p?m?s]
¦ noun a light and porous form of solidified lava, used as a skin abrasive.
¦ verb rub with pumice.
Derivatives
pumiceous pju:'m???s adjective
Origin
ME: from OFr. pomis, from a L. dialect var. of pumex, pumic-; cf. pounce2.

Wikipedia

Pumice

Pumice ( ), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls, and being dark colored and denser.

Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. The depressurization creates bubbles by lowering the solubility of gases (including water and CO2) that are dissolved in the lava, causing the gases to rapidly exsolve (like the bubbles of CO2 that appear when a carbonated drink is opened). The simultaneous cooling and depressurization freeze the bubbles in a matrix. Eruptions under water are rapidly cooled and the large volume of pumice created can be a shipping hazard for cargo ships.

Ejemplos de uso de pumice
1. Tambora launched a thick column of ash, pumice, and gas into the sky.
2. Fortunately that created a pumice–like rock instead of a huge explosion.
3. The ground was hot and appeared to vibrate beneath the pumice stone, a volcanic rock that floats on water.
4. After that the abuse rained down continually upon the hapless Mr O‘Brien, like rocks and pumice from a spluttering volcano.
5. A few hundred miles away, Anak Krakatao, or the Child of Krakatoa‘‘ in English, fired pumice and lava onto its slopes.