THE AMOUNT OF MATTER IN A GIVEN VOLUME Density: THE AMOUNT OF MATTER IN A GIVEN VOLUME
UNDERSTANDING DENSITY Different substances have different densities. If the density of an object is greater than the density of a fluid, it will sink when placed in the fluid. What would happen if the density of an object is less than the density of a fluid?
UNDERSTANDING DENSITY Different substances have different densities. If the density of an object is greater than the density of a fluid, it will sink when placed in the fluid. What would happen if the density of an object is less than the density of a fluid? IT FLOATS!!!
UNDERSTANDING DENSITY What if the object has the SAME density as the liquid?
UNDERSTANDING DENSITY
CALCULATING DENSITY Units: liquids and gases: grams per millilitre (g/mL) kilograms per litre (kg/L) solids: grams per cubic centimetre (g/cm3)
Density and PMOM Most Dense Least Dense
Changing Density Increasing temperature = Lower density BIGGER SPACES BETWEEN THE PARTICLES, MORE VOLUME Increasing concentration = increasing density MORE PARTICLES, SMALLER SPACES
Density and Buoyancy When an object is in a liquid, the force of gravity pulls it down. The liquid, however, exerts an OPPOSITE force, called the BUOYANT FORCE that pushes the object upward. If the density of the object is greater than the liquid, the object will sink because force of gravity > buoyant force. If the density of the object is less than the liquid, the object will float because buoyant force > force of gravity.