I made these slides for a HS Chemistry course within my properties of matter unit while discussing intensive properties. After the slides, we discussed density demos (underwater volcano, candles in water and isopropyl, and liquid displacement of a gummy bear). Then, all students did a mini-lab: rainbow saltwater density straws. Homework was a density problem set.
An intensive property that depends only on the composition of a substance, and not on the size of a sampleDensity can be used to identify substances
The next most expensive metal in the world is Osmium. In chemical element, it is symbolized with the level Os. It lays on the atomic number 76. Osmium is included in the family of Platinum. The quality of this metal is brittle, hard and available in blue color. This material usually is used to build an alloy. It can make such product become durable and sturdy.
For example, oil has a density of 0.85 g/cm3 and seawater has a density of 1.02 g/cm3. When these two liquids are mixed together, the denser seawater forms a layer underneath the less dense oil.
Bone density is done with a specialized x-ray machine (below). X-rays come up from below the patient and is detected by sensors in the arm over the patient. Bone density relates to bone strength. The condition of osteoporosis (porous bones) exhibits a lower density of the bone and makes bones more prone to breakage.
A real diamond will sink but a fake diamond such as moissanite will float in the solvent diiodomethane (CH2I2) which has a density of 3.33g/cm3.
Life Support in Space: When sleeping, your warm breath is pushed upward and away from your face by the cooler more dense air in the room. That way you don't keep breathing your own breath and suffocate. However, in the weightlessness condition in a space craft, the air you breath out will stay close to your face, so you would suffocate unless you kept moving or if the air was circulated. Gravity pulls more on the cool room air, which gets under and lifts up the warmer less dense air from the breath. Without gravity that doesn't happen (hot air does not rise in zero gravity). So spacecraft and places like the International Space Station must take that into consideration. We take the affects of density for granted because we live in a gravity environment, but in a zero gravity environment some of the effects of density are simply not there.
Introduction to density
W H A T D E T E R M I N E S T H E D E N S I T Y O F A
S U B S T A N C E ?
The amount of matter in a given volume
Density is constant for all
sample size of a given substance
Mass units: grams or kilograms
Volume units: mL, L, or cm3 (solids)
Osmium is a very dense metal. If a piece of osmium
has a mass of 50g and a volume of 2.22cm3, what is
Solve for Mass or Volume
using the Formula Triangle
Life Support in Space!
When sleeping, your warm
breath is pushed upward
and away from your face by
the cooler, more dense air
in the room
In space, hot air does not
rise in zero gravity
conditions, so need air
circulation in International
Rainbow Saltwater Density Straws: Mini-Lab
Source: Steve Spangler