loading...| Preferred Name |
Temperature |
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| Synonyms |
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| Definitions |
A thermodynamic state property that is the driving force for the flow of heat energy and is a measure of the heat content of a material entity |
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| ID |
http://bhi.washington.edu/OPB#OPB_00293 |
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| comment |
A thermodynamic state property that is the driving force for the flow of heat energy and is a measure of the heat content of a material entity |
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| discussion |
Because temperature is an intensive property that properly only applies to a single point in an entity, assigning a "temperature" as a property of a discretized physical entity that extends is space presents problems. If temperature is constant over the spatial extent of an entity (i.e., it is "isothermic") then it is fair to say that the entity has a single value of temperature. Such an assumption is quite often made for homeothermic biological organisms and their parts. However, it is not meaningful to calculate a spatial integral of temperature derive an "average” temperature because such integrals have meaning only for extensive properties like mass density or current density. However, some analyses do aim to account explicitly for temperature gradients that drive heat transfers between entities or parts of entities. In such cases it is useful to define, for continuum modeling, a spatial distribution for temperature and heat fluxes. However, for discrete modeling, the temperature of an entity can be assigned a value while its parts are assigned different temperatures — the discrete analogue of a continuum temperature distribution. For example, the temperature of mitochondria is likely to be higher than the surrounding portion of cytosol. That being said, there is utility in expressing that a discrete, dynamical entity can have a discrete temperature property with one value while allowing one or more of its parts to have separate temperature properties with different values. For computational purposes one can make the assumption that all parts of an entity share the same temperature property instance as the (whole) entity while parts that have a different temperature will have their own temperature property with a value that may difffer from the temperature value of the whole entity (and the other parts). |
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| label |
Temperature |
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| PATO_id |
PATO:0000146 |
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| prefixIRI |
OPB:OPB_00293 |
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| prefLabel |
Temperature |
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| wikipedia |
"A temperature is an objective comparative measurement of hotness or coldness." https://en.wikipedia.org/wiki/Temperature Because temperature is an intensive property that properly only applies to a single point in an entity, assigning a "temperature" as a property of a discretized physical entity that extends is space presents problems. If temperature is constant over the spatial extent of an entity (i.e., it is "isothermic") then it is fair to say that the entity has a single value of temperature. Such an assumption is quite often made for homeothermic biological organisms and their parts. However, it is not meaningful to calculate a spatial integral of temperature derive an "average” temperature because such integrals have meaning only for extensive properties like mass density or current density. However, some analyses do aim to account explicitly for temperature gradients that drive heat transfers between entities or parts of entities. In such cases it is useful to define, for continuum modeling, a spatial distribution for temperature and heat fluxes. However, for discrete modeling, the temperature of an entity can be assigned a value while its parts are assigned different temperatures — the discrete analogue of a continuum temperature distribution. For example, the temperature of mitochondria is likely to be higher than the surrounding portion of cytosol. That being said, there is utility in expressing that a discrete, dynamical entity can have a discrete temperature property with one value while allowing one or more of its parts to have separate temperature properties with different values. For computational purposes one can make the assumption that all parts of an entity share the same temperature property instance as the (whole) entity while parts that have a different temperature will have their own temperature property with a value that may difffer from the temperature value of the whole entity (and the other parts). |
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| subClassOf |