A type of heat loss that occurs when the heat is removed by air current is known as?

Appeared in: DSSSB - 28 August 2019 (Shift-1)

Explanation

Convection is the process of heat transfer from the body to the environment through the movement of air or fluid.
When air currents (like wind or from a fan) pass over the skin, they carry away the warm air that is close to the body.
Cooler air then replaces this warm air, and the process repeats, leading to continuous heat loss.
The question's mention of 'air current' is the key phrase that specifically points to convection as the answer.

Option A: Radiation is the transfer of heat through electromagnetic waves from a warmer object to a cooler one without direct contact. It does not involve air currents.
Option B: Conduction is the transfer of heat through direct physical contact between objects. It does not involve the movement of air.
Option C: Evaporation is the process of heat loss that occurs when a liquid (like sweat) is converted into a gas (vapor) on the skin's surface. While moving air can increase the rate of evaporation, the primary mechanism described by 'air current' carrying heat away is convection.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mechanisms of heat loss as background academic context rather than a clinical decision trigger.
Understanding heat loss mechanisms is critical for nurses, especially in preventing hypothermia in vulnerable patients like newborns, the elderly, and surgical patients.
Nurses use these principles to manage patient temperature, such as using blankets to reduce radiation and conduction loss, or using fans for convective cooling in febrile patients.
What if? If a patient is both febrile and diaphoretic (sweating heavily), and a fan is used, heat loss occurs through both convection (the moving air) and evaporation (the drying of sweat), making the cooling effect more pronounced.

How to Approach the Question

First, read the question carefully and identify the key phrase: 'heat is removed by air current'.
Next, review the four options, which are all mechanisms of heat transfer.
Recall the definition of each mechanism.
Match the key phrase 'air current' to its corresponding definition. Convection is the transfer of heat by the movement of fluids, including air.
Therefore, convection is the correct answer.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 10-12

E6 Physiology Ganong 27e Vol 1 Part 2 p. 96-98

Practise the full DSSSB - 28 August 2019 (Shift-1)

Attempt every question from this paper in a timed mock, then review the full solution for each one.