# Density

### 22 terms by swatanabe Teacher

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Density and Buoyancy

### The definition of Density

the amount of matter in a given space, or volume

### The equation for finding density

D=M/V or Density = Mass/Volume

### common units for density

g/cm3 or g/mL or kg/m3 or kg/L

1 g/mL

### Is density a physical or chemical property

physical property

### definition of buoyant force

the upward force that fluids exert on all matter

### Archimedes' Principle

the buoyant force on an object in fluid is an upward force equal to the weight of the fluid that the object takes the place of, or displaces

less than 1 g/mL

### objects that sink in water have a density

greater than 1 g/mL

### when an object's weight is greater than the buoyant force

the object will sink

### when an object's weight is less than the buoyant force

the object will buoy up

### when an object's weight is equal to the buoyant force

the object will float

### Why do helium balloons float and balloons filled with carbon dioxide don't?

helium is less dense than air while carbon dioxide is more dense than air

### How can a steel ship float when steel has a higher density than water?

the ship's hull is shaped so that the ship has a larger volume and therefore a smaller density

### How do you make a submarine sink?

Fill the ballast tanks with water to increase the density of the submarine

### How do you make a submarine rise?

Pump air into the ballast tanks to decrease the density of the submarine

mL or L

cm3 or m3

g or kg

LxWxH

### how to find the volume of an irregular solid

water displacement : H2O final vol - H20 initial vol

### tool used to find mass

triple beam balance

Example: