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Related Concept Videos

Specific Heat01:16

Specific Heat

67.6K
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.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...
67.6K
Quantifying Heat02:46

Quantifying Heat

62.2K
Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...
62.2K
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

6.8K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
6.8K
Heating and Cooling Curves02:44

Heating and Cooling Curves

28.0K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
28.0K
Heat Engines01:10

Heat Engines

3.7K
A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
3.7K
Heat and Free Expansion01:24

Heat and Free Expansion

2.9K
The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the path. Like work, when heat is added to a thermodynamic system, it undergoes a change of state, and the state attained depends on the path from the initial state to the final state. Consider an ideal gas cylinder fitted with a piston. When the cylinder is heated at a constant temperature, the gas molecules absorb energy and expand slowly in a...
2.9K

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Preparation of Single-cohort Colonies and Hormone Treatment of Worker Honeybees to Analyze Physiology Associated with Role and/or Endocrine System
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Without Warning: Worker Deaths From Heat 2014-2016.

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Worker heat deaths differ from the general population due to occupational exposures. Current heat warnings and prevention strategies are inadequate for protecting workers from climate change-exacerbated heat risks.

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Area of Science:

  • Occupational Health
  • Environmental Health
  • Climate Change Adaptation

Background:

  • Worker heat exposure presents unique risks compared to the general population, often involving outdoor work in variable temperatures and younger demographics.
  • Climate change is intensifying heat events, increasing their frequency, duration, and variability, posing greater risks to outdoor laborers.
  • Existing public health heat warning systems, like the National Weather Service's Heat Index, do not adequately consider occupational factors such as direct sun exposure and physical exertion.

Purpose of the Study:

  • To highlight the inadequacy of current heat warning systems and prevention advice for protecting workers.
  • To emphasize the need for tailored public health surveillance and response strategies for occupational heat illness.
  • To underscore the impact of climate change on increasing heat-related risks for the working population.

Main Methods:

  • Analysis of worker heat-related fatalities, comparing occurrence with National Weather Service heat warnings.
  • Review of common heat illness prevention advice and its applicability to occupational settings.
  • Consideration of climate change impacts on temperature variability and acclimatization effectiveness.

Main Results:

  • A significant majority of worker heat-related fatalities (72%) occurred on days without official heat advisories.
  • Standard heat illness prevention recommendations often overlook workers' limited control over rest and cooling.
  • Temperature variability due to climate change may diminish the effectiveness of traditional acclimatization strategies.

Conclusions:

  • Current public health approaches fail to adequately address the specific vulnerabilities and contexts of worker heat exposure.
  • Occupational heat illness prevention requires specialized strategies that account for workplace conditions and climate change.
  • Public health surveillance and response must be adapted to better protect workers from escalating heat risks.