something that indicates or fixes a limit or extent
Example: Rivers, mountain ranges, oceans, and deserts can all serve as physical boundaries
es: Límites
Boundary conditions
Noun
Are constraints necessary for the solution of a boundary value problem. A boundary value problem is a differential equation (or system of differential equations) to be solved in a domain on whose boundary a set of conditions is known
Example: if there is a heater at one end of an iron rod, then energy would be added at a constant rate but the actual temperature would not be known.
es: Condiciones de borde
Emissivity
Noun
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a perfect emitter, known as a blackbody, at the same temperature and wavelength and under the same viewing conditions.
Energy balance
Noun
An energy balance is a consideration of the energy input, output, and consumption or generation in a process or stage. In establishing an energy balance, all sources of thermal energy are put on the input side, and all items of heat utilization on the output side.
Example: Your energy balance is the balance of calories consumed through eating and drinking compared to calories burned through physical activity
es: Balance de energía
Heat conduction equation
Noun
The heat conduction equation can be derived by performing an energy balance on a differential volume element
Example: Chocolate candy in your hand will eventually melt as heat is conducted from your hand to the chocolate
es: Ecuación de conducción de calor
Heat flux
Noun
can be defined as the rate of heat energy transfer through a given surface, and heat flux density is the heat flux per unit area.
Example: Getting cold feet from standing on a cold floor: since the floor has a lower temperature than the feet, heat flows from the feet to the floor.
es: Flujo de calor
Insulation
Noun
Insulation is a barrier that minimizes the transfer of heat energy from one material to another by reducing the conduction, convection and/or radiation effects.
Example: Fiberglass put into the walls of a house and into the attic in order to keep warm air in and cold air out during the winter months is an example of insulation
es: Aislamiento
Internal energy
Noun
is the energy contained within it. It is the energy necessary to create or prepare the system in any given internal state.
Example: a glass of water at room temperature which is kept on a shelf or table. This glass of water has no apparent energy
es: Energía interna
per unit volume
Noun
Unit volume is a volume equal to 1 standard volume unit in the system of units you are using.
Example: The mass density of an object is defined as its mass per unit volume
es: Por unidad de volumen
surrounding
Noun
the circumstances, conditions, or objects by which one is surrounded
Example: The surrounding mountains are lofty and rugged
es: rodeando
temperature coefficient of thermal conductivity
Noun
Coefficient of thermal conductivity of a solid material is the rate of flow of heat per unit area per unit temperature gradient across the solid.
Example: Coefficient of thermal conductivity of a solid material is the rate of flow of heat per unit area per unit temperature gradient across the solid.
es: coeficiente de temperatura de conductividad térmica
Thermal conductivity
Noun
The rate at which heat is transferred by conduction through a unit cross-section area of a material, when a temperature gradient exits perpendicular to the arejavascript:void(0);a.
Example: the process of heating a pan on a stove. The heat from the burner transfers directly to the surface of the pan
es: Conductividad térmica
Thermal diffusivity
Noun
describes how well a material can spread heat, taking into account both how quickly the heat can be conducted through and how quickly its own temperature can change when the material is heated
Example: air has a low thermal conductivity but a relatively high thermal diffusivity this means that while air can only absorb a relatively small amount of thermal energy, it is effective at diffusing the energy.
es: Difusividad térmica
Thermal symmetry
Noun
A heat transfer problem that is symmetric about a plane, line, or point is said to have thermal symmetry about that plane, line, or point. The thermal symmetry boundary condition is a mathematical expression of this thermal symmetry
Example: A heat transfer problem that is symmetric about a plane, line, or point is said to have thermal symmetry about that plane, line, or point.
es: Simetría Térmica
Variation
Noun
Variation refers to the differences or deviations from the recognized norm or standard
Example: any perturbation of the mean motion or orbit of a planet or satellite, particularly of the moon
