The conclusion is that water is not seeping through the glass tumbler; instead, the extra water on the outside is due to condensation of water vapor from the air.
NCERT Book Curiosity Science Class 6
Chapter 8 A Journey through States on Water
What conclusion can be drawn from the observation that the water level inside the tumbler remains the same while water collects outside?
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The observation that the water level inside the tumbler remains the same while water collects outside suggests condensation. Moisture from the air condenses on the cooler surface of the tumbler, forming droplets outside without affecting the internal water level.