[Jewelry making - Article 00740] - Re: [Orchid] Ultrasonic cleaner and damage to hands

[TheCynic6]

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>     I wonder why I can add a beaker of liquid, especially water and
>     find that it never boils in the ultrasonic cleaner. Why would water
>     in tissues do this? hmm.... After thinking a bit, I remember. These
>     are mostly microscopic bubbles that collapse as quickly as they are
>     created. In fact, in a contained medium such as living tissue,
>     they may not even be created at all. I would like some
>     substantiation before I would assume that the bubbles are a
>     reality. That is really my point to the my original post. 

    Take a beaker of acetone or alcohol and place it in the ultrasonic.
    The acetone will most notably show the effect of the energy of the
    sound waves. The reason it can be seen in these two and not in water
    is because of their lower boiling points. It takes less energy to
    make a noticeable amount of gas form. 

    The rumor I have always heard was that ultrasonic waves deteriorated
    bone marrow, but that is only rumor and I don't have time to verify
    it. I know if I place my hand in the wrong place in my ultra sonic
    it causes a sharp pain inside the finger. Common sense says that if
    it hurts do not do it. That is evidence enough for me that it is not
    a good practice and I usually try to avoid it. 

>     This begs the question, how much of the energy in the ultrasonic
>     cleaner do you assume travels up the tree into Tina's hand? Why
>     would it stop at the wire? For that matter why would it stop at her
>     hand. Maybe it travels through her head on into the ether.

    The energy doesn't travel up the tree and into Tina's hand. Were
    dealing with waves. Waves propagate outward in all directions until
    they "bounce" off of an object or dissipate to a low enough energy
    that the are undetectable. What you feel when you hold a part in the
    ultrasonic, a part that extends outside 

    the fluid so that you hand is not submerged, is the effect of the
    waves moving the part. The part then moves your hand. Through this
    chain reaction it would be logical to assume that the transfer of
    energy through this process is significantly inefficient so that no
    harm would result.  If your really paranoid wear cloth gloves.
    Remember were dealing with sound waves. Sound waves can only
    propagate by causing molecules to shift. That is one reason we use a
    dense fluid medium inside an ultrasonic. The material in the gloves
    would containa significant amount of airspace inside its structure
    to dissipate nearly all remaining waves emanating from the parts
    vibrations. 

Matt


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