Part I - Object more dense than water 1. Measure the mass of the unknown object in air. Record the mass in table 1. 2. Measure the apparent mass of the unknown object in water. Record the apparent mass in table 1. Part II - Object less dense than water If an object is less dense than a fluid, it won't stay under the surface of the fluid. Float the block of wood in the beaker of water. Estimate what percent of the block is submerged. Record the percentage in table 1. Data. Table 1 Mass of the unknown object in air [kg] Apparent mass of the unknown object in water [kg] Weight of the unknown object in air [N] Weight of the unknown object in water [N] Percent of the block submerged