Commentary for Zevachim 50:18

ומי איכא מידי דבשעת שחיטה בן שנה בשעת הולכה וזריקה בן שתים

R'Hiyya said in R'Johanan's name: This proves that the air-space of a vessel is as the vessel [itself].<span class="x" onmousemove="('comment',' When the water flows over the hand, it does not fall directly into the barrel but first spreads out over the air-space above it. If that airspace were not as the barrel itself, the water would be regarded as falling from the air into the barrel, not from the hand, and so would be fit.');">¹³</span>

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