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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...
Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
Thermal Expansion01:22

Thermal Expansion

The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
Efficiency of The Carnot Cycle01:16

Efficiency of The Carnot Cycle

The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
Hot Weather Concreting01:20

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...

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Related Experiment Video

Updated: Jul 5, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

Dengue in Guyana.

C J Palmer, L Validum, V A Vorndam

    Lancet (London, England)
    |August 10, 1999
    PubMed
    Summary
    This summary is machine-generated.

    Dengue fever cases in Guyana have dramatically increased, with 50 infections found in a 2-day clinic evaluation. This contrasts sharply with previous years, indicating a significant public health concern.

    Keywords:
    AmericasDengueDeveloping CountriesDiseasesExaminations And DiagnosesGuyanaMeasurementPrevalenceResearch MethodologyResearch ReportScreeningSouth AmericaViral Diseases

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    Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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    Last Updated: Jul 5, 2026

    Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
    07:32

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    Published on: April 10, 2017

    High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
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    Published on: February 5, 2020

    Area of Science:

    • Medical Entomology
    • Tropical Medicine
    • Epidemiology

    Background:

    • Dengue fever (DF) and dengue hemorrhagic fever (DHF) incidence has risen significantly across South America.
    • Guyana historically reported minimal dengue cases, with fewer than five annually for most of the past decade.
    • A recent 2-day clinical evaluation in Georgetown, Guyana, identified 50 dengue infections.

    Discussion:

    • The findings suggest a substantial underestimation of dengue prevalence in Guyana.
    • This surge indicates a potential shift in the epidemiological landscape of dengue in the region.
    • Urgent public health interventions are necessary to control potential outbreaks.

    Key Insights:

    • A Georgetown clinic identified 50 dengue infections over two days.
    • This represents a dramatic increase compared to Guyana's historical dengue reporting.
    • The study highlights a critical need for enhanced dengue surveillance in Guyana.

    Outlook:

    • Further research is needed to understand the drivers of this increased dengue incidence.
    • Enhanced vector control programs and public awareness campaigns are crucial for Guyana.
    • Continued monitoring is essential to track the spread and impact of dengue in the country.