Rankle #90 answer: density (lightest to densest)

The answer

Rank by density (lightest to densest)

1. 1Air1.2 kg/cubic metre
2. 2Water1,000 kg/cubic metre
3. 3Aluminium2,700 kg/cubic metre
4. 4Gold19,300 kg/cubic metre

Why this order

Ranked lightest to densest, Air (1.2 kg/cubic metre) goes at the top and Gold (19,300 kg/cubic metre) at the bottom.

The closest call is Water (1,000 kg/cubic metre) against Aluminium (2,700 kg/cubic metre), about 2.7 times apart. That is the swap most likely to cost a point.

The biggest gap is between Air and Water, about 830 times apart, so that boundary should be the easiest part of the order to get right.

From top to bottom the figures span a factor of roughly 16,000.

These are the figures the game reveals after you submit. They are rounded; only the order is scored.

Difficulty: easier, judged by how close the tightest pair is.

Similar puzzles: Rankle #12, Rankle #102, Rankle #119.

How it was scored

right slot, one place out, two or more out. The score is how many items sit in the right slot, and only 4/4 is a win. Full rules on the how to play page.