304:thermal transer

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304:thermal transer
2014-03-09 13:01:44
thermal energy transfer

thermal energy transfer
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  1. the transfer of heat between two objects that are touching each other is called:
  2. the transfer of heat by the movement through a medium (usually air or water) is called:
  3. the transfer of energy without the use of a medium is called:
    • radiation
    • 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:
  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
    • skin, adipose, fascia, muscle
  7. describe refraction:
    bending of a wave
  8. the process of a medium collecting thermal energy and changing it into kinetic energy is called:
  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
  11. is your tx appropriate?
    is it causing a desired phyisologic change?

    the ability of a modality or tx to produce the intened effects is called:
  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