Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Quantifying Heat02:46

Quantifying Heat

61.8K
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...
61.8K
Specific Heat01:16

Specific Heat

67.3K
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...
67.3K
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

6.7K
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...
6.7K
Heating and Cooling Curves02:44

Heating and Cooling Curves

27.4K
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...
27.4K
Heat and Free Expansion01:24

Heat and Free Expansion

2.8K
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...
2.8K
Heat Engines01:10

Heat Engines

3.6K
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...
3.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Lupus erythematosus panniculitis in a 77-year-old woman.

Dermatology online journal·2026
Same author

Environmental and Social Drivers of Hidradenitis Suppurativa.

JAMA dermatology·2026
Same author

GLP-1 receptor agonist use in patients with psoriasis or hidradenitis suppurativa.

JAAD international·2026
Same author

Switching between Janus kinase inhibitors for treatment of alopecia areata: A multicenter retrospective review.

Journal of the American Academy of Dermatology·2026
Same author

Image Generation of Common Dermatological Diagnoses by Artificial Intelligence: Evaluation Study of the Potential for Education and Training Purposes.

JMIR dermatology·2025
Same author

Authors' Reply: The Importance of Comparing New Technologies (AI) to Existing Tools for Patient Education on Common Dermatologic Conditions: A Commentary.

JMIR dermatology·2025
Same journal

Pellagra associated with iron deficiency.

Dermatology online journal·2026
Same journal

Demodicosis: A frequently underrecognized cause of recalcitrant ear pruritus.

Dermatology online journal·2026
Same journal

Association of alopecia areata with COVID-19 vaccination: A vaccine adverse events reporting system analysis.

Dermatology online journal·2026
Same journal

Gender based price differences in 5% minoxidil foam: The impact of generic alternatives and bulk packaging.

Dermatology online journal·2026
Same journal

Retrospective analysis of filler complications reported in the manufacturer and user facility device experience database from 2015 to 2025.

Dermatology online journal·2026
Same journal

Characterizing barriers to care in patients with hidradenitis suppurativa.

Dermatology online journal·2026
See all related articles

Related Experiment Video

Updated: Jan 24, 2026

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

7.6K

Local heat urticaria.

Forrest White1, Gabriela Cobos, Nicholas A Soter

  • 1New York University Langone Health, New York.

Dermatology Online Journal
|February 16, 2018
PubMed
Summary
This summary is machine-generated.

This case study details a 38-year-old woman diagnosed with heat urticaria, a rare condition causing skin reactions to heat. Prompt diagnosis and management are key for patients experiencing this physical urticaria.

More Related Videos

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
11:34

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

11.6K
Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
10:29

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

Published on: June 1, 2016

12.4K

Related Experiment Videos

Last Updated: Jan 24, 2026

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

7.6K
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
11:34

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

11.6K
Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
10:29

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

Published on: June 1, 2016

12.4K

Area of Science:

  • Dermatology
  • Immunology

Background:

  • Heat urticaria is a rare physical urticaria triggered by heat exposure.
  • It can manifest in localized, generalized, immediate, or delayed forms.

Observation:

  • A 38-year-old woman presented with symptoms suggestive of heat urticaria.
  • Physical examination revealed a linear wheal after mechanical stroking.
  • The patient developed well-demarcated, erythematous blanching wheals on her forearm and hand within five minutes of hot water exposure.

Findings:

  • Heat provocation testing confirmed local heat urticaria in the patient.
  • The reaction involved erythema and blanching wheals consistent with urticaria.

Implications:

  • This case highlights the importance of accurate diagnosis of physical urticaria through provocation testing.
  • Antihistamines and heat desensitization are potential treatment strategies.
  • Understanding the varied presentations of heat urticaria is crucial for effective patient management.