Permeability

Business / Construction / Permeability: A measure of the ease with which water penetrates a material.

Permalloy Tape Head

Technology / Home Audio / Permalloy Tape Head: A cassette tape head constructed of permalloy, an alloy made primarily of nickel and iron, used for its superior high wear resistance and permeability, offering superior frequency response at a low co MORE

Groundwater

Business / Agriculture / Groundwater: The water from wells and underground aquifers. An estimated 95% of the drinking water used in rural areas is from groundwater. Because of its use as drinking water, there is concern over contamination MORE

Hydraulic Conductivity

Science / Geology / Hydraulic Conductivity: A measure of the permeability of a rock or soil: the volume of flow through a unit surface in unit time with unit hydraulic pressure difference as the driving force. MORE

Action Potential

Science / Biology / Action Potential: A reversal of the electrical potential in the plasma membrane of a neuron that occurs when a nerve cell is stimulated; caused by rapid changes in membrane permeability to sodium and potassium. MORE

Antidiuretic Hormone (ADH)

Science / Biology / Antidiuretic Hormone (ADH): A hormone produced by the hypothalamus and released by the pituitary gland that increases the permeability of the renal tubule of the nephron and thereby increases water reabsorption; also known as va MORE

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