The density, or more precisely, the volumetric mass density,

Density

When was density discovered?

HOW!

Displacement method

Types of measurements

Usually in this method the solid is irregular so, to find it’s volume,

• U need to fill up a measuring cylinder with water.
• Then note the measurement
• Slowly place the irregular solid it the water and then record the new measurement
• After that subtract the second reading from the first:

The density can be measured by two ways :

Regular irregular

V2-V1

AND

density also can be used to diffrentiate between other substances

Sometime around 250 BCE, the Greek mathematician Archimedes was given the task of determining whether a craftsman had defrauded the King of Syracuse by replacing some of the gold in the King's crown with silver. Archimedes thought about the problem while relaxing in a bathing pool. As he entered the pool, he noticed that water spilled over the sides of the pool. Archimedes had a moment of epiphany. He realized that the amount of water that spilled was equal in volume to the space that his body occupied. This fact suddenly provided him with a method for differentiating a mixed silver and gold crown from a pure gold crown. Because a measure of silver occupies more space than an equivalent measure of gold, Archimedes placed the craftsman's crown and a pure gold crown of equivalent mass in two tubs of water. He found that more water spilled over the sides of the tub when the craftsman's crown was submerged. It turned out that the craftsman had been defrauding the King! Legend has it that Archimedes was so excited about his discovery that he ran naked through the streets of Sicily shouting "Eureka! Eureka!" (the Greek word for "I have found it!").

Irregular objects

Regular objects

Density of irregular objects :

The mass is still measured by a balance

While, the volume is measured using a displacement method

Density of regular objects :

The mass is measured by a balance

The volume is measured is measured using a rular

changes in density

Measurement

Density is measured in kg/m3 or g/m3 and it is represented by the fellow formula : ​​=​​/​​

For an easy method ! It can be represented this way also:

what is density

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume.

More about density

For example:

If u have a bottle with diffrent liquids...

the one that has a density less than water 1 gram per cubic centimeter will float on water.

So, in that way u can know which is which !!!!!!!!!!!!!!!!!!!!!!!

In general, density can be changed by changing either the pressure or the temperature.

Increasing the pressure always increases the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalization. For example, the density of water increases between its melting point at 0 °C and 4 °C; similar behavior is observed in silicon at low temperatures.