The purpose of this experiment was to measure the density of a solid and a liquid using Archimedes principle. Archimedes is one of the greatest inventors and mathematicians of all time. The principle we used in this experiment was discovered when Archimedes stepped into a full bath tub. Using Archimedes principle, we were able to determine the density of a lead rod, water, and an unknown liquid.
Name| MW (g/mol)| ρ (g/cm3)| bp (˚C)| mp (˚C)|
water| 18.01 g/mol| 1 g/cm3| 100 ˚C| 0 ˚C|
lead| 207.2 g/mol| 11.34 g/cm3| 1749˚C| 327.5˚C|
Spring ConstantF=-kxThe equation was used to calculate the spring constant of spring i.| Densityρ=massvolumeThis equation was used to calculate the density of an object.| Buoyant ForceB=Δmg=ρf VobjgThis equation was used to calculate the buoyant force of an object.| Experimental Procedure:
ProcedureA: * Setup similar to the spring constant lab * Use the same or a similar spring from the spring constant lab * Find the spring constant of the smallest spring used from previous lab if not already foundB: * Use the same metal rod from the Error of Propagation experiment and attach it to the bottom of the spring * Fully submerged the metal rod in a beaker of water * Record the displacement of the submerged object * Repeat several times making sure the object is fully submerged and steadyC: * Dry the object and then repeat part B with an unknown liquid| Observations * Used spring i. We worked with a different group so we used their spring with their known spring constant. * Used an iron rod, which is what the group we worked with used before. * Starting volume decreased after the first trial * Displacement in the unknown liquid was very similar to that of water|
Spring constant: k=0.023 N/m
This was received from the group we worked with.