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작성자플러스씨 조회 0회 작성일 2020-10-17 07:10:59 댓글 0

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Density - Why does oil float on water? | #aumsum #kids #science #education #children

Topic: Density
Why does oil float on water?
Hey.
Did you realize that a large log of wood floated on water but a comparatively smaller piece of rock sank?
How is this even possible?
This is possible because of density.
It is the measure of the mass of an object per unit volume.
In the first case, the log of wood floats on water because it has less density than water.
This means that the amount of mass present in unit volume of wood is less than the amount of mass present in unit volume of water.
However, in the second case, the piece of rock sinks because it has more density than water.
This means that the amount of mass present in unit volume of rock is more than the amount of mass present in unit volume of water.
Do you know why the helium filled balloon is rising up in the air?
This is again because of density.
The balloon consists of helium gas which has less density than the surrounding air, hence it rises up.
Here, have a look.
Oil is floating on water.
Are you assuming that this is because of density?
Yes, you are right.
Oil has less density than water.
Hence, it floats.
However, there is another reason due to which oil floats on water.
The reason is that both oil and water are immiscible liquids, that is, they do not mix with each other even if we shake them.
They separate out into two layers when kept undisturbed for sometime.

Density

Just like all matter water has physical properties that can be measured and calculated. To find the mass of water you will need a beaker and a scale. First find the mass of the empty beaker. Next, fill up the beaker to your desired amount. Then use the scale to find the mass of the filled beaker. To find the mass of just the water, subtract the mass of the empty beaker from the full beaker. Our sample is 100 grams.

The volume of water can be measured using a graduated cylinder. Our sample is 100ml.

Density is calculated by dividing the mass by the volume. Plug in our measured mass at 100 grams and divide that by our measured volume of 100 ml. Water's density is 1 g/ml.

Objects with a density greater than 1g/ml will sink when placed in water. Objects with a density less than one will float when placed in water. If a block has a density of 0.1g/cm3 it will float because it's density is less than 1. Another block with a density of 0.5g/cm3 will also float because its density is less than 1. Notice that more of the block is below the waterline. A block with a density of 0.9g/cm3 is more dense so more of the block will be below the waterline. We can see that as density increases more of the block is below the waterline. Scientists have discovered that the blocks density will tell us exactly where the block will come to rest. If the density is 0.1g/cm3 then 10% will be below the waterline. To calculate where a block will come to rest just convert the density to a percent.

Density explains why ice floats. If you freeze water it expands. The black dots represent the atoms in water. No new atoms were are added to the water so because of the expansion there is more room between the atoms. Compared to the atoms in liquid water, the atoms in the ice are not as tightly packed together causing the ice to float. Try calculating density of ice for yourself. If you get a number less than one it will float. You can also predict how much of it will be below the waterline.
squared_SAM m : I had to create an experiment for science to find the density of water and thus saved me
100basketball100 Roblox : 0:01
SJH KFC | Agnes Phooko : is volume and density the same thing?
John Joseph VERANGA : 0:04
Christina Arnokouros : no❤
Melly Yudu-Sie : Wow this vid is old
Einarly : Hi guys
Dubby : 0:04





















Density
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Gaingam Gangmei : If the water get below say 3.25C the pressure of density increases

What is Density? | Gravitation | Physics | Don't Memorise

Understanding the concept of Density is very important in order to understand Physics.
Watch this video to fully grasp the idea of density.

To get access to the entire course based on Gravitation, enrol here: https://bit.ly/Gravitation_G9

In this video, we will learn:
0:00 Introduction
0:52 Density
1:14 Density Formula
1:24 Unit of Density
1:32 Why Wood Floats on Water?

To watch more Physics videos, click here: https://bit.ly/PhysicsVideos_DMYT

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#Density #Gravitation #Physics
Don't Memorise : #DidYouKnow: Changing the pressure or temperature of an object will generally change its density. As temperature decreases, the motion of the molecules in a substance slows down; as they slow, they require less space, causing density to increase. Conversely, an increase in temperature usually results in a decrease in density.
To get access to the entire course based on Gravitation, enrol here: https://bit.ly/Gravitation_G9
To watch more Physics videos, click here: https://bit.ly/PhysicsVideos_DMYT
Collin Arsenault : Bad 1/10
Aishwarya Kurakula : Can you make a vedeo on work,power and displacement.........your vedeos inspire me to study........thanks a lot
SJH KFC | Agnes Phooko : is volume and density the same thing?
raja H : Thanks a lot
I will al ays support your channel
Francis Halam : Mam .. What do we mean when we mass per unit volume,Force perunit area etc..plz make a video on this topics
Manjula Tondyal : Explain briefly
Haritha Goud : What is this
Haritha Goud : W ho
jimin's jams : this channel vids are the only thing that got me skipping classes

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#density

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