1. The problem statement, all variables and given/known data A small balloon was inflated with air at 1460 ft above sea level at a temperature of about 75 F. After inflating it was attached to a nanometer and depressed 18.25 inches of water. It was then tied-off. It's mass, with the nipple removed, measured about 156 milligrams. The volumetric displacement of the balloon was then measured by submerging in a 5 cup glass graduated kitchen measuring-thing. The volume of displaced water measured 360 ml. Placed in a 7 inch deep kettle over 1 inch of boiling water, it sank to the bottom (as expected) rather than floating. What was the minimum wetness of the steam as measured in grams of suspended water droplets per total grams consisting of both suspended water droplets and vapor? Better said, what minimum wetness of steam, measured in grams per total grams, would be required to achive boyancy in this experiment? 2. Relevant equations ... 3. The attempt at a solution I have a CRC handbook with a table for standard atmosphere at given elevation, but it doesn't correct for actual temperature. Without correction, I get an air density in the balloon of 1.105 grams per liter. Is that correct? I obtained a boiling point of 205 F for steam at 1460 feet alt. (right or wrong?) Using an online steam density calculator I got .528 grams per liter for dry steam. How's this number?