200. Heat


See also 90. COLD ; 162. FIRE

actinism
the ability of light and heat and other forms of radiant energy to cause chemical changes, as hormonal changes in birds causing them to migrate or brood. —actinic , adj.
adiathermancy
imperviousness to radiant heat or infrared radiation. Also called athermancy .
athermancy
adiathermancy.
calorimetry
the science of measuring heat. —calorimeter , n . —calorimetric , adj.
calorist
Rare. one who believed the caloric theory, that heat is a material substance. —caloristic , adj.
galvanothermy
the process of generating heat by means of an electric current.
geothermometry
the branch of geology that measures temperatures deep below the surface of the earth; geologic thermometry.
pyrogenesis
the production or generation of heat. —pyrogenetic , adj.
pyrolysis
the chemical process of decomposition under the effect of heat. —pyrolitic , adj.
pyrophotometer
a type of pyrometer that measures temperature optically or photometrically.
tepidity
a moderate warmth; lukewarmness. —tepid , adj.
thermatology
Medicine. the study of heat as a medical remedy or therapy. Also called thermotherapy .
thermionics
the science or study of the emission of electrons from substances at high temperatures. —thermionic , adj.
thermochemistry
the branch of chemistry that studies the relationship of heat to chemical changes, including the production of energy. —thermochemist , n . —thermochemical , adj.
thermodynamics
the branch of physics that studies the relationship of heat and mechanical energy and the conversion, in various materials, of one into the other. —thermodynamicist , n. —thermodynamic, thermodynamical , adj.
thermogenesis, thermogeny
the production of heat, especially in an animal body by physiological processes. —thermogenic, thermogenous , adj.
thermography
1. Engineering, a method of measuring surf ace temperatures by using luminescent materials.
2. a printing or photocopying process using infrared rays and heat.
3. a process of photography using far-infrared radiation; thermal photography. —thermographer , n. —thermographic , adj.
thermokinematics
the study of the movement of heat. —thermokinematic , adj.
thermology
Archaic. the science and study of heat. Also called thermotics .
thermoluminescence
Atomic Physics. any luminescence appearing in materials upon application of heat, caused by electron movement which increases as the temperature rises. —thermoluminescent , adj.
thermolysis
Physiology. the dispersion of heat from the body. —thermolytic , adj.
thermometry
the branch of physics that deals with the measurement of temperature. —thermometric , adj.
thermophobia
an abnormal fear of heat.
thermoscope
a device for giving an approximation of the temperature change of a substance by noting the accompanying change in its volume. —thermoscopic , adj.
thermostatics
the science or study of the equilibrium of heat.
thermotaxis
1. Biology. the movement of an organism toward or away from a source of heat.
2. Physiology. the regulation of body temperature by various physiological processes. —thermotactic, thermotaxic , adj.
thermotherapy
thermatology.
thermotics
thermology.
transcalency
the property or quality by which matter permits the passage of heat. —transcalent , adj.

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