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how salty does the sea have to be for an egg to float?

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gracie w

on 14 January 2014

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Transcript of how salty does the sea have to be for an egg to float?

How Salty Does The Sea Have To Allow An Egg To Float?
Density
describes how much matter is in a certain volume of a substance.
how heavy something is, in relation to its volume.
something dense, can be heavy while being small.
something less dense might be bigger but yet weigh less.
to find density, divide it’s mass by its volume.
things with less density will float
things with higher density will sink.
How Salt Affects Density

Salt affects density when you add large amounts of salt to a liquid.
It does not really effect it when there is not a lot of salt.
When salt is mixed with water it lowers the freezing point.
The volume increases a small amount, mass increases a lot.
That is why when salt mixes with water things with higher density float.

Salt In The Sea
* every liter of water salt contains about 3.5% (or 35 grams).
* Scientists estimate the sea contains 50 quadrillion tons (50 million billion tons) of dissolved salt.
* The vast majority of seawater saltiness of between 3.1% and 3.8%.
* Red sea, most amount of salt
* Baltic Sea, least amount of salt
Two Factors That Contribute To Density

1. The mass of the atoms or molecules that make up the material.
2. The volume or amount that the materials make up. If the molecules or atoms are “packed” in more closely, it will be denser.
Volume
Volume is the amount of 3-dimensional space an object occupies or its capacity.
used in math and science
Volume is the length times the width times the height
L x W x H (formula)

Capacity

* Capacity describes the amount that something can hold.
* usually the maximum amount.
* measure capacity with milliliters or liters (when it hast to do with water)
* you measure small amounts using milliliters and larger using liters.
Examples:
jug
teacup or mug
a container
a petrol tank.
amount of people, liquid, or things that something can hold.
What is Eggshell made up of?
*bird’s eggshell is made up of keratin fibers and calcite crystals.
*regular eggshell is made up of calcite and protein.
* pale yellowish- white.
* thin
* delicate
* break easily
* brittle
* fragile.
* little to no gloss.
Salt
mineral substance made of sodium chloride.
in its natural state forms as crystalline mineral is also known as rock salt or halite.
used for preserving and seasoning food
cows and other animals lick blocks of salt.
12% of salt is used in water
been used ever seen the Neolithic era.
Why Is The Sea Salty?
The sea is salty because over the years when it evaporates, the water becomes saltier and saltier.
It started out slightly salty
Rain breaks up rocks into minerals which fall into the sea.
All water is salty even if you do not see it or taste it.
72 chemicals have been found in sea water.
How Salty Does The Sea Have To Be For An Egg To Float?
Gracie Whitesell
6
th
Mrs. Carson
temperature
convergence
divergence
salinity
For my 6th grade AIG project I chose to research How Salty the Sea must be for an egg to float? I chose this topic because it seems cool that an egg can float in water.
Hypothesis
I think the egg will float in 800 milliliters of water when I add four tablespoons of salt. Once I add the salt I think it will take a couple seconds before the egg will begin to float to the top.
Materials
~ Graduated cylinder
~ Water
~ 4 Eggs
~ 1 Container of Salt
~ 4 Beakers
~ Tablespoon
~ Triple Beam Balance
Procedure
Gather all materials
Pour 800 milliliters of water into each beaker
Leave Beaker A without salt,
Add 1 tablespoon salt to beaker B,
Add 2 tablespoons salt to Beaker C,
Add 3 tablespoons of salt to Beaker D
Add 1 egg to each beaker and see which one floats(if the egg doesn't float keep adding salt until it floats)
Measure jar with water on triple beam balance and record data,
Measure jar and record the data,
Subtract the numbers to find the capacity
clean up
Data
i saw that the more salt I added the more the egg was able to float, but still fell back to the bottom until I reached 6 tablespoons. When I put the salt in the water the water level started to rise a little at a time. I started out with 800 milliliters of water, but when I added the 6 tablespoons of salt in the water the level had risen to 1000 milliliters.
Conclusion
It takes about 6 tablespoons of salt added to 800 milliliters of water to allow an egg to float. Once I added the 6 tablespoons of salt to the water the level rose to the 1000 milliliter mark. This project was fun and I'm glad I was able to do it.
Bibliography
http://www.palomar.edu/oceanography/salty ocean.com
http://marinelife.about.com/od/marinelife101/f/How-Salty-Is-The-Ocean.html
http://www.utdallas.edu/~pujana/oceans/why.html
http://ga.water.usgs.gov/edu/whyoceansalty.html
http://dictionary.reference.com/browse/eggshell
Grade
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