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Related Concept Videos

Decreased Body Temperature01:29

Decreased Body Temperature

A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by sustained extreme cold exposure, and severe...
Thermoregulation01:26

Thermoregulation

The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from the...
Body Temperature01:25

Body Temperature

The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
Body Temperature01:07

Body Temperature

Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C (97–99°F), remaining relatively stable...
Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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.
As many physical properties depend on temperature, the variety of thermometers is...

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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
07:46

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block

Published on: January 30, 2026

THERMOSTAT FOR LOWER TEMPERATURES.

T J Stier1, W J Crozier

  • 1Laboratory of General Physiology, Harvard University, Cambridge.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Simple thermostats offer precise temperature control down to 0°C or above room temperature. These devices allow for rapid adjustments to new temperature levels at short intervals.

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Area of Science:

  • Thermodynamics
  • Instrumental analysis

Background:

  • Precise temperature control is crucial for various scientific experiments and industrial processes.
  • Existing thermostat designs may lack simplicity, affordability, or the ability for rapid temperature adjustments.

Purpose of the Study:

  • To detail the construction and operation of simple, effective thermostats.
  • To demonstrate thermostats capable of maintaining precise temperatures from 0°C upwards.
  • To highlight the thermostats' ability to facilitate quick temperature changes.

Main Methods:

  • Construction of simple thermostat apparatus.
  • Operational testing to verify temperature maintenance accuracy.
  • Evaluation of the speed of temperature level alteration.

Main Results:

  • Successfully constructed and operated simple thermostats.
  • Demonstrated precise temperature maintenance down to 0°C (with water).
  • Achieved capability for rapid temperature adjustments to new setpoints.

Conclusions:

  • Simple thermostats can be built to achieve precise temperature control.
  • These thermostats are suitable for applications requiring stable temperatures or frequent adjustments.
  • The described design offers a practical solution for accessible temperature regulation.