Search results
Results from the WOW.Com Content Network
Directional freezing can freeze water, from only one direction or side of a container, into clear ice. [1] [2] [3] Directional freezing in a domestic freezer can be done by putting water in a insulated container so that the water freezes from the top down, and removing before fully frozen, so that the minerals in the water are not frozen. [4]
Frazil ice also forms in oceans, where windy conditions, wave regimes and cold air also favor the establishment of a supercooled layer. [7] [8] Frazil ice can be found on the downwind side of leads and in polynyas. In these environments, that ice can eventually accumulate at the water surface into what is referred to as grease ice.
Needle ice phenomena play a particularly significant role in patterned ground in periglacial environments. [8] The growth of needle ice lifts a detached, frozen soil crust riding on top of the layer of ice. When the crust and the ice melt, the soil surface settles back irregularly. This phenomenon is linked to erosion, particularly on ...
Most liquids freeze by crystallization, formation of crystalline solid from the uniform liquid. This is a first-order thermodynamic phase transition, which means that as long as solid and liquid coexist, the temperature of the whole system remains very nearly equal to the melting point due to the slow removal of heat when in contact with air, which is a poor heat conductor.
Each white lump marks the top of a deep ground-freezing tap. Cross section of a ground freezing pipe as used in the Big Dig. Ground freezing is a construction technique used in circumstances where soil needs to be stabilized so it will not collapse next to excavations, or to prevent contaminants spilled into soil from being leached away. [ 1 ]
Regelation is the phenomenon of ice melting under pressure and refreezing when the pressure is reduced. This can be demonstrated by looping a fine wire around a block of ice, with a heavy weight attached to it. The pressure exerted on the ice slowly melts it locally, permitting the wire to pass through the entire block.
Ice forms in layers which are parallel to the overlying surface. [2] The ice initially forms with small microfractures parallel to the surface. As ice accumulates the ice layer grows outward in what is frequently characterized as an ice-lens parallel to the surface. [2] Ice will form in water-permeable rock in much the same way as it forms in ...
Ice calving, also known as glacier calving or iceberg calving, is the breaking of ice chunks from the edge of a glacier. [1] It is a form of ice ablation or ice disruption . It is the sudden release and breaking away of a mass of ice from a glacier , iceberg , ice front , ice shelf , or crevasse .