Is Air Dragged into Water When Using a Spoon with a Hole?

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Discussion Overview

The discussion revolves around the phenomenon of bubbles emerging when using a spoon with a hole in it in a cup of water. Participants explore whether this indicates that air is being introduced into the water and consider related concepts such as dissolved gases and agitation effects.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Justin questions if the bubbles indicate that air is being introduced into the water.
  • Some participants suggest that the bubbles could be due to dissolved oxygen already present in the water.
  • One participant challenges the idea that agitation can lead to chemical reactions, emphasizing that mixing does not combine oxygen molecules.
  • Another participant mentions that agitation can release dissolved gases, drawing a parallel to shaking a can of soda before opening it.
  • A later reply introduces the concept of cavitation, explaining that a pressure reduction behind an object moving through water can potentially drag air down into the water.
  • There is a suggestion for Justin to provide a video for further clarification.

Areas of Agreement / Disagreement

Participants express differing views on the cause of the bubbles, with some attributing it to dissolved gases and others considering the effects of agitation and cavitation. The discussion remains unresolved with multiple competing explanations.

Contextual Notes

Some assumptions about the nature of the water and the specific conditions under which the bubbles form are not fully explored. The discussion does not clarify the extent to which agitation affects the introduction of air into the water.

bhpv
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Hi,

If i use a spoon with a hole in it in a cup of water, bubbles emerge. Does that mean that air got in?

Regards,

Justin
 
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Water can contain disolved oxygen so could just be that. You haven't really given us much info.
 
CWatters said:
Water can contain disolved oxygen so could just be that. You haven't really given us much info.

Isnt that impossible? Simply mixing something in water does not bring chemical reactions into place. Also not putting oxygen together. Or do you mean water with bubbles?

I mean normal water at the kitchen sink.
 
Agitation (eg stirring) is a good way to release disolved gasses. Try shaking a can of soda before opening it.
 
CWatters said:
Agitation (eg stirring) is a good way to release disolved gasses. Try shaking a can of soda before opening it.

Ok, if there is reaction to agitation, this is chemical. I try to see how 'big' bubbles come into existence by say stirring with a kind of stick.
 
Cavitation?

Edit: Perhaps I'd better explain... When an object is dragged through water you can get a pressure reduction behind the object. This can cause air to be dragged down into the water.

If not that then I suggest you post a video.
 
Last edited:

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