Question

which type of water is the least dense?

Answer 1

http://www.engineeringtoolbox.com/water-density-specific-weight-d_595.html

Answer 2

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Answer 3

Is least dense at when the water is at freezing point; when it freezes and becomes ice:)

Answer 4

@cindyyy That is most dense. Water is least dense just below boiling point (by the site linked by aaronq). Solid ice is less dense still (1.81 slugs/ft^3), while steam (as a gas) could theoretically approach density=0.