# 304:thermal transer

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1. the transfer of heat between two objects that are touching each other is called:
conduction
2. the transfer of heat by the movement through a medium (usually air or water) is called:
convection
3. the transfer of energy without the use of a medium is called:
• ex: sun, diathermy
4. the change from the liquid state to the gaseous state that requiers thermal energy to be removed from the body is called:
evaporation
5. describe reflection:
• return of the wave; bounces off the skin
• ultrasound: thats why gel is needed, w/o gel the wave bounces back into the wand
6. describe transmission:
• energy is transfered to to the deepest tissues from superfiscial
7. describe refraction:
bending of a wave
8. the process of a medium collecting thermal energy and changing it into kinetic energy is called:
absorption
9. to enable energy to affect the body, it must be absorbed by the tissues at a level sufficient to stimulate a physiological response, is called:
arndt-schultz principle
10. the arndt-schultz prinicple is translated into clinical application through:
the application of the proper modality, at the proper intensity, for the appropriate duration
is it causing a desired phyisologic change?

the ability of a modality or tx to produce the intened effects is called:
efficacy
12. Electromagnetic energy is most efficently transmitted to the tissues when it strikes body at a 90 angle

because the angle of incidience deviates away from 90 degrees, the efficiency of the energy affecting the tissues is decreased by:
Cosine Law

effective energy = Energy x cosine of the angle of incidence

intensity of tx is reduced
13. the intensity of the energy striking the tissues is proportional to the square of the distance between the source of the energy and the tissues called:
• inverse square law
• the further away your tx is, the less intense it is
14. the inverse relationship between the penetration and absorption of energy is called:
law of grotthus draper

• more absorption=less penetration
• less absorption=more penetration
• ex: hot pack- superficical surface absorbs heat, so it doesnt allow for penetration deeper
15. the amount of energy needed to increase the temperature of a substance by a given number of degrees is called:
specific heat

• the greater the specific heat = more energy required to heat
• substances with higher specific heat hold more energy
16. the conductive heat transfer is dependent on which 6 things:
• area applied
• thermal conductivity of tissues
• total time the modality is applied
• temperature gradient b/w modality and tissues
• distances separating the thermal gradient
• greater temperature gradient = deeper effects of tx
 Author: itzlinds ID: 265631 Card Set: 304:thermal transer Updated: 2014-03-09 17:01:44 Tags: thermal energy transfer Folders: Description: thermal energy transfer Show Answers: