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DENSITY �OF FLUIDS

UNDERSTANDING MATTER & ENERGY FLUIDS

MRSTAV

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.1 demonstrate an understanding of viscosity and compare the viscosity of various liquids

(e.g., water, syrup, oil, shampoo, ketchup)

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

2.5  use scientific inquiry/experimentation skills to identify factors that affect the flow rates of various fluids

MRSTAV

CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.2 describe the relationship between mass, volume, and density as a property of matter

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

2.2  determine the mass-to-volume ratio of different amounts of the same substance

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

2.3  investigate and compare the density of a variety of liquids

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CURRICULUM

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DENSITY

78lbs

12lbs

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MASS VS WEIGHT

mass is a measure of the amount of matter in an object

​

weight is a measure of how strong the force of gravity is on that object

​

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MASS VS. WEIGHT

your MASS is the same whether you are one the Earth or the Moon but your WEIGHT changes

The Moon exerts about �1.6 N per kg of mass

The Earth exerts about �9.8 N per kg of mass

NASA

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VOLUME

Volume is a measure of how much space an object occupies

Volume =

(v)

length

(l)

x width

(w)

x height �(h)

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1000cm3�=�1000 mL�=�1 L

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VOLUME

We can find volume using:

  1. CALCULATIONS
  2. DISPLACEMENT
  3. READINGS

FINDING

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CALCULATIONS

Calculate the volume, in mL and in L, of a container that is 5 cm long, 10 cm wide and 13 cm tall.

v = l x w x h

v = 5 x 10 x 13

v = 650.0mL

convert to L

1

2

3

v = 0.65L

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DISPLACEMENT

10mL

20mL

30mL

40mL

  • Record the initial volume.
  • Place the object in the water.
  • Record the final volume.
  • Subtract the initial volume from the final volume.

15mL

40mL

40mL - 15mL = 25mL

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READING

Bring the eye down so it is level with the bottom of the meniscus and read the volume.

The curved line is called the meniscus.

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1 POUND OF FEATHERS?

1 POUND OF ROCKS

WHAT’S HEAVIER?

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BOTH TAKE UP THE SAME VOLUME

EACH HAVE VERY DIFFERENT MASSES

THE ROCKS ARE VERY DENSE

THE FEATHER ARE NOT VERY DENSE

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DENSITY

the tighter the particles are packed together in a substance, the greater the density is

is a measure of the mass per unit volume of a substance

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DENSITY

is a measure of the mass per unit volume of a substance

DENSITY =

(d)

mass (m)

volume (v)

_________ ___

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DENSITY

  • we measure the density of liquids using volume measurements of mL, L, etc.

​

  • we measure the density of solids using volume measurements of mm3, cm3, etc.

is a measure of the mass per unit volume of a substance

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TRY IT - Calculate the density of cooking oil

An empty container has a mass of 50 g. When 75 mL of oil are placed in it the total mass is 120 g. Calculate the density of the oil.

d = m / v

m = 120g – 50g

m = 70g

​

d = m / v

d = 70g / 75mL

d = 0.93 g/mL

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v

VOLUME

d

DENSITY

m

MASS

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v

VOLUME

d

DENSITY

m

MASS

MASS = Volume x Density

​

VOLUME = Mass ÷ Density

​

DENISTY = Mass ÷ Volume

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PREDICT

OBSERVE

EXPLAIN

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DISCOVERING�DENSITY

PREDICT

OBSERVE

EXPLAIN

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PREDICT

P

PREDICT

OBSERVE

EXPLAIN

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PREDICT

P

List the substances from the predicted least dense to the predicted most dense.

PREDICT

OBSERVE

EXPLAIN

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OBSERVE

O

PREDICT

OBSERVE

EXPLAIN

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PREDICT

OBSERVE

EXPLAIN

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  • …

ADD IT TO THE

W

WORD

W

WALL

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UNDERSTANDING MATTER & ENERGY FLUIDS

2.1  follow established safety practices for using apparatus, tools, and materials

MRSTAV

CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

2.6  use technological problem-solving skills to design, build, and test devices that use pneumatic or hydraulic systems

MRSTAV

CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.3 explain the difference between solids, liquids, and gases in terms of density, using the particle theory

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.4 explain the difference between liquids and gases in terms of their compressibility and how that affects their usage.

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.5 Determine the buoyancy of an object, given it density, in a variety of fluids

(e.g., less dense objects float, more dense objects sink)

MRSTAV

CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.6 explain in qualitative terms the relationship between pressure, volume, and temperature when a liquid or a gas is compressed or heated

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.7 explain how forces are transferred in all directions in fluids (Pascal’s law)

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

…

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CURRICULUM

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UNDERSTANDING MATTER & ENERGY FLUIDS

3.6  explain in qualitative terms the relationship between pressure, volume, and temperature when a liquid (e.g., water) or a gas (e.g., air) is compressed or heated

MRSTAV

CURRICULUM