Density & Buoyancy 2425

Front

Why do objects easily float in the Dead Sea?

Back

There are a large amount of salts in the Dead Sea making Dead Sea water very dense. (This allows even heavy objects to float within it)

Front

When the famous Greek scientist Archimedes lowered himself into a bathtub, he discovered that the water level...

Back

rose because his body and the water could not occupy the same space at the same time. (This is called fluid displacement. He used this method in part of his experiment to help the King determine if his crown was pure gold).

Front

What does water displacement mean?

Back

The amount of water that either rises or gets pushed aside by an object after it is submerged.

Front

Density can be defined as the amount of...

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mass within the volume of an object (It is the amount of matter or "stuff" found within an object).

Front

Density Formula:

Back

D = M/V

(If you write the formula down on paper and examine it, remember that it looks like a heart. Keep in mind that the density of an object is how much mass is found within the volume of an object. Therefore, it's mass divided by volume and not volume divided by mass.)

Front

Some common metric units for density:

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g/L (grams/liter)

g/ml (grams/ml)

g/cm^3

(grams/cubic centimeter: usually applies to solids)

Front

A violet colored liquid is found in a clear glass container. The liquid's density will be measured with which units?

Back

g/mL

Front

True or False: Density is mass divided by volume

Back

True

Front

What would you use to determine the volume of an irregular shaped rock that you found in the park?

Back

graduated cylinder
water (enough to cover the rock)
string (to lower the rock into the water)

Front

An object has a mass of 4.0 g. It is placed in a cylinder that has 6.0 ml of water. The water level rises to 10.0 ml after being submerged. What is the object's volume? What is the object's density?

Back

Volume of object = Final volume minus initial volume
(10.0 ml - 6.0 ml)

Volume of object = 4.0 ml

D = M/V

D = 4.0g divided by 4.0 ml = 1.0 g/ml