9% less dense 9% less dense 9% less dense Water: Density http://water.usgs.gov/edu/density.html 8.3 pounds per gallon 8.3 pounds per gallon "Water Density" https://water.usgs.gov/edu/density.html Water density pesa menos que el agua fría 9% less dense 8.3 pounds per gallon U.S. Geological Survey: Water Density USGS rather than freezing solid "Water Density" "Water Density" "Water Density" 9% less dense http://water.usgs.gov/edu/density.html https://water.usgs.gov/edu/density.html