Lecture 5: Thermal Agents

Question 1

What are Thermal Agents?

Answer 1

Heat transfer to, from, or within the body

Question 2

What is Specific Heat?

Answer 2

amount of energy required to raise the temp by a given number of degrees

Question 3

Methods of Heat Transfer

Answer 3

Conduction
Convection
Conversion
Radiation
Evaporation

Question 4

Conduction

Answer 4

energy exchange by direct collision between the molecules of two materials at different temperatures

Question 5

Rate of heat transfer affected by:

Answer 5

Temperature difference between hot/cold pack and person
Type of material (skin, adipose, muscle)
Size of target area

Question 6

Convection

Answer 6

Heat transfer as the result of direct contact between a circulating medium and another material of a different temperature

Question 7

Conversion

Answer 7

Conversion of a nonthermal form of energy, such as mechanical, electrical, or chemical energy, into heat

Question 8

Radiation

Answer 8

the direct transfer of energy from a material with a higher temperature to one with a lower temperature with the need for an intervening medium or contact

Question 9

Evaporation

Answer 9

Energy absorbed as heat during change from liquid to gas

Question 10

Primary Goals of Cryotherapy

Answer 10

↓ local tissue temperature
↓ thermal metabolic rate
**Greatest benefit in acute injury