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Related Concept Videos

Thermometers and Temperature Scales01:22

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Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
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Heat Capacities of an Ideal Gas II01:23

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For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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Heat Capacities of an Ideal Gas III01:25

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The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
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Area of Science:

  • Physiology
  • Comparative Biology
  • Thermoregulation

Background:

  • Endothermy, the ability to generate internal heat, is a hallmark of mammals and birds.
  • Maintaining a stable, elevated body temperature (around 40°C) is characteristic of these vertebrate classes.
  • The evolutionary and physiological advantages of this specific thermal niche remain a key question in biology.

Purpose of the Study:

  • To explore the scientific explanations for the consistent body temperature maintenance in mammals and birds.
  • To investigate the potential benefits of a body temperature around 40°C for physiological efficiency.
  • To synthesize current understanding of the thermoregulatory strategies in endotherms.

Main Methods:

  • Review of existing literature on mammalian and avian physiology and thermoregulation.
  • Analysis of metabolic rates and enzyme kinetics at different temperatures.
  • Comparative study of physiological performance across various endothermic species.

Main Results:

  • A body temperature near 40°C optimizes metabolic enzyme function and energy production.
  • This thermal range provides a balance between metabolic efficiency and the risk of heat damage.
  • Stable thermoregulation allows for consistent physiological performance across diverse environmental conditions.

Conclusions:

  • The consistent body temperature of approximately 40°C in mammals and birds is a result of evolutionary optimization.
  • This temperature range maximizes cellular efficiency and supports the high activity levels characteristic of endotherms.
  • Thermoregulation at this level is critical for survival and ecological success in these animal groups.