Why does liquid rhythmically jump in a running blender?

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bulloughclan
What makes a liquid rhythmically "jump" in a running blender?

What makes a liquid rhythmically "jump" in a running blender?
 
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resonance of standing waves
 
blender

But in a blender the waves aren't traveling in opposite directions, are they? So how do you get resonance of standing waves?
 
I'm assuming you're talking about the blender vibrating, and the waves are coming off the walls of the container portion of the blender. Where the waves meet and make constructive interference, is where the liqiud jumps.
 
Oh yeah. That makes sense now. Thank you for your answers.