hydraulic fluid
A synthetic or mineral-based fluid that transfers power in hydraulic equipment and machinery.
Entries starting with H
315 entries.
hydraulic radius
nounHydraulics
For a porous material, the ratio of porosity (ratio of volume of interstitial space filled with fluid to volume of material) to specific surface area (ratio of surface area in contact with fluid to volume of material); for a pipe or channel, the ratio of cross-sectional area to wetted perimeter.
hydric
adjectiveForestry and timber
Sufficiently wet to inhibit the survival of many species.
hydriding
nounMetallurgy
A process of reducing an ore to a metal by treatment with hydrogen at high temperature
hydrolox
A type of binary rocket fuel composed of liquid oxygen (lox) oxidizer and liquid hydrogen combustible.
hydromesic
adjectiveForestry and timber
Moderately wet, but less than hydric.
hydroplaning
nounAutomotive
The loss of contact with the road because of surface water; the act of aquaplaning.
hydroponic
adjectiveAgricultural equipment
Of a plant; pertaining to or grown using hydroponics, a method of growing plants using mineral nutrient solutions in water, without soil.
hydrostatic lock
A condition that arises when a device which compresses gases seizes up because of the infiltration of liquid, which prevents further compression.
hydrostatic pressure relief system
A system of drains and moisture barriers used to regulate the hydrostatic pressure in the earth surrounding a below-grade structure.
hypercyclopean
adjectiveOptics and imaging
Describing the perception of depth by means of a single eye
hypergolic
adjectiveAviation maintenance
Igniting spontaneously upon contact with an oxidizer.
hyperlens
A nanostructured metamaterial that produces magnified images of objects smaller than the wavelength of the light used
hypersonic
adjectiveAviation maintenance
Of a speed, equal to, or greater than, or capable of achieving, five times the speed of sound.
hügelkultur
A type of permaculture in which the composting involves raised planting beds constructed on top of decaying wood debris (such as logs, tree limbs, and stumps) and other compostable biomass plant materials.