Water is spilled on a table in the Fundamentals Lab in the Engineering Building at BYU, and air (at 1 m/s) blows over the film of liquid. The temperature of the room, air, water film, and floor (the entire system) is 25 C (298.15 K), and the ambient pressure in the room is 86 kPa = 86000 Pa. What is the ambient concentration (density) of water in the room (, ) that would be used in the expression =(,,) to calculate the mass transfer rate of the water if the ambient relative humidity is 0.78? Report your answer in units of kg/m3 with three significant digits .