A child holds a grape beside three separate liquid bottles and one completely empty tall glass.
your mission

Build a liquid catcher for a sinking grape

mission started — pour the bands carefully

A grape sinks in water. Could a carefully poured stack catch it before the glass bottom? Build the bands, then predict exactly where it stops.

clue 1

Compare the same amount

The same child holds one measuring scoop between separate gold, blue, and plum liquid bottles.

Use the same scoop each time. Some liquids pack more weight into that same space. That packed-in heaviness is called density.

weigh equal scoops

Light, middle, heavy

same-size scoopoil · lightest
oilwatersyrup
try three careful pour orders

What stacks up—for a while?

pour orderoil → water → syrup
light firstmixed orderheavy first
with a careful pour: same stack, for a while
weigh the traveler

The grape fits between

same spacewater · less dense
watergrapesyrup
put the clues together

The bands are ready—for now

While the carefully poured bands stay separate, the grape is denser than water but less dense than syrup. How far will it travel?

Commit before the grape enters the temporary stack.

While the bands stay separate, where will the grape stop?