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| Terms for subject Environment (5179 entries) |
| hibridació | hybridization (The act or process of producing hybrids that is an animal or plant resulting from a cross between genetically unlike individuals. Hybrids between different species are usually sterile) | |
| hidràulica | hydraulics (The branch of science and technology concerned with the mechanics of fluids, especially liquids) | |
| hidràulica agrícola | agricultural hydraulics (Science and technology involved in the management of water resources, in the control of erosion and in the removal of unwanted water) | |
| hidrobiologia | hydrobiology (Study of organisms living in water) | |
| hidrocarbur alicíclic | alicyclic hydrocarbon (A class of organic compounds containing only carbon and hydrogen atoms joined to form one or more rings and having the properties of both aliphatic and cyclic substances) | |
| hidrocarbur aromaticopolicíclic | polycyclic aromatic hydrocarbon (Hydrocarbons containing two or more closed rings of atoms) | |
| hidrocarbur clorat | chlorinated hydrocarbon (A class of persistent, broad-spectrum insecticides that linger in the environment and accumulate in the food chain. Among them are DDT, aldrin, dieldrin, heptachlor, chlordane, lindane, endrin, mirex, hexachloride, and toxaphene. In insects and other animals these compounds act primarily on the central nervous system. They also become concentrated in the fats of organisms and thus tend to produce fatty infiltration of the heart and fatty degeneration of the liver in vertebrates. In fishes they have the effect of preventing oxygen uptake, causing suffocation. They are also known to slow the rate of photosynthesis in plants. Their danger to the ecosystem resides in their rate stability and the fact that they are broad-spectrum poisons which are very mobile because of their propensity to stick to dust particles and evaporate with water into the atmosphere) | |
| hidrocarbur halogenat | halogenated hydrocarbon (One of a group of halogen derivatives of organic hydrogen and carbon containing compounds; the group includes monohalogen compounds (alkyl or aryl halides) and polyhalogen compounds that contain the same or different halogen atoms) | |
| hidrocarbur policíclic | polycyclic hydrocarbon (Hydrocarbon molecule with two or more nuclei; examples are naphtalene, with two benzene rings side by side, or diphenyl, with two bond-connected benzene rings. Also known as polynuclear hydrocarbon) | |
| hidrocarburs | hydrocarbon (A very large group of chemical compounds composed only of carbon and hydrogen) | |
| hidrocarburs alifàtics | aliphatic hydrocarbon (Hydrocarbons having an open chain of carbon atoms, whether normal or forked, saturated or unsaturated) | |
| hidrocarburs aromàtics | aromatic hydrocarbon (Hydrocarbons having an unsaturated ring containing alternating double and single bonds, especially containing a benzene ring) | |
| hidrogen | hydrogen (A flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding) | |
| hidrogeologia | hydrogeology (The science dealing with the occurrence of surface and ground water, its utilization, and its functions in modifying the earth, primarily by erosion and deposition) | |
| hidrografia | hydrography (Science which deals with the measurement and description of the physical features of the oceans, lakes, rivers, and their adjoining coastal areas, with particular reference to their control and utilization) | |
| hidròlisi | hydrolysis (1. Decomposition or alteration of a chemical substance by water. 2. In aqueous solutions of electrolytes, the reactions of cations with water to produce a weak base or of anions to produce a weak acid) | |
| hidrologia | hydrology (The science that treats the occurrence, circulation, distribution, and properties of the waters of the earth, and their reaction with the environment) | |
| hidrometeorologia | hydrometeorology (That part of meteorology of direct concern to hydrologic problems, particularly to flood control, hydroelectric power, irrigation, and similar fields of engineering and water resource) | |
| hidrometria | hydrometry (The science and technology of measuring specific gravities, particularly of liquids) | |
| hidrosfera | hydrosphere (The waters of the Earth, as distinguished from the rocks (lithosphere), living things (biosphere), and the air (atmosphere). Includes the waters of the ocean; rivers, lakes, and other bodies of surface water in liquid form on the continents; snow, ice, and glaciers; and liquid water, ice, and water vapour in both the unsaturated and saturated zones below the land surface. Included by some, but excluded by others, is water in the atmosphere , which includes water vapour, clouds, and all forms of precipitation while still in the atmosphere) |