What dictates what can "pass through" and what stays in your stomach?

Hi. What dictates what can "pass through" and what stays in your stomach? I understand water just passes through (which explains why I can drink much more than I thought I could). But what about soup, protein drinks or other foods that "melt-in-your-mouth"? I had a lap RNY on 06-20-01. I am eating pureed tuna salad and soft eggs, in addition to my liquids. TIA

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