5 Solids Liquids Gases- Part B “Density and Pressure”
Syllabus Aims…
5.3 know and use the relationship between density, mass and volume:
density = mass / volume
ρ = m / V
5.4 practical: investigate density using direct measurements of mass and volume.
5.5 know and use the relationship between pressure, force and area:
pressure = force / area
p = F / A
5.6 understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions
5.7 know and use the relationship for pressure difference:
pressure difference = height × density × gravitational field strength
p = h × ρ × g
Resources…
Use this PowerPoint for a quick review…5 SLG Part B Density and Pressure
Density Learning Check
Density Practical Booklet Y11
Density Problems Sheet 1
Worksheet Investigating pressure
Analysis Sheet Pressure in Fluid
Useful Videos…
Archimedes Eureka : Measuring Volume by Displacement | Physics
How do you measure the volume of your watch? With the help of Archimedes’ Eureka story! Archimedes discovered that the volume of a body can be measured by liquid displacement. ...Learning this makes it easy to understand Archimedes' Principle!
Don't miss the Part 2 video on Archimedes’ Principle & buoyant force: https://youtu.be/_p-hwElkrlk
Solutions of top 3 questions: https://youtu.be/8_lKYI9Zeug
Try solving them to see if you got it right! The questions are shown at the end of the video.Show MoreArchimedes Eureka : Measuring Volume by Displacement | Physics
How do you measure the volume of your watch? With the help of Archimedes’ Eureka story! Archimedes discovered that the volume of a body can be measured by liquid displacement. ...Learning this makes it easy to understand Archimedes' Principle!
Don't miss the Part 2 video on Archimedes’ Principle & buoyant force: https://youtu.be/_p-hwElkrlk
Solutions of top 3 questions: https://youtu.be/8_lKYI9Zeug
Try solving them to see if you got it right! The questions are shown at the end of the video.Show More Floating and Sinking - Density - Magic 8 Pool Ball
The pressure at a certain depth in a liquid depends on…
height of liquid above the base (∆h)
density of the liquid (𝜌) (symbol rho)
gravitational field strength (g)
∆𝒑=𝝆𝒈∆𝒉 ... or 𝒑=𝝆𝒈𝒉
A floating object experiences a greater pressure on the bottom surface than on the top surface. This creates a resultant force upwards. This force is called the upthrust. When solid objects are placed in water they will float or sink depending on the density of the solid material compared with the density of water. If the object is denser than the liquid it will sink because the weight is greater than the upthrust. If the object is less dense than the liquid the upthrust is greater than the object's weight and it will float to the surface. If the object has exactly the same density as the liquid it will stay still, neither sinking nor floating upwards. The weight is equal to the upthrust. For example, ice floats on water because it is less dense than water. Lead sinks in water because it is denser than water.
You could also work out the density of an object in water 𝒑 = m/V which allows you to work out the forces acting down and see how that balances with the upthrust created by objects trying to float.Show More What Is Density? (Chemistry Explained Simply)
What is density, and how do you calculate it?
This video explains density in a simple, student-friendly way and shows how mass and volume are related.
In this lesson, you’ll learn:
• ...What density means in chemistry
• The density formula (mass ÷ volume)
• How changing mass or volume affects density
• Why density is useful for identifying substances
This video is great for:
• High school chemistry
• Intro physical science
• Homework help and exam review
👉 If density problems have ever been confusing, this explanation will help it click.
Want more fast chemistry help?
⚡ Chemistry Homework in 3 MINUTES OR LESS!
https://www.youtube.com/playlist?list=PLfWuBca_SOr_FmVuuLtPNzJBp-uNr6ztJ
Don’t forget to like, subscribe, and comment to let me know what chemistry topic you want help with next!
#chemistry #density #physicalscience #highschoolchemistry #sciencehelpShow More Pressure in Liquids - 𝒑=𝝆𝒈𝒉
This is a super practical demo to show how a taller fluid column has a higher pressure difference, it also works well for siphoning beer or wine into a new ...vessel.
The pressure at a certain depth in a liquid depends on…
height of liquid above the base (∆h)
density of the liquid (𝜌) (symbol rho)
gravitational field strength (g)
∆𝒑=𝝆𝒈∆𝒉 or 𝒑=𝝆𝒈𝒉
A floating object experiences a greater pressure on the bottom surface than on the top surface. This creates a resultant force upwards. This force is called the upthrust. When solid objects are placed in water they will float or sink depending on the density of the solid material compared with the density of water. If the object is denser than the liquid it will sink because the weight is greater than the upthrust. If the object is less dense than the liquid the upthrust is greater than the object's weight and it will float to the surface. If the object has exactly the same density as the liquid it will stay still, neither sinking nor floating upwards. The weight is equal to the upthrust. For example, ice floats on water because it is less dense than water. Lead sinks in water because it is denser than water.
You could also work out the density of an object in water 𝒑 = m/V which allows you to work out the forces acting down and see how that balances with the upthrust created by objects trying to float.Show More GCSE Physics - What is Pressure?
GCSE Physics - Liquid Pressure & Upthrust
GCSE Physics - Atmospheric Pressure
Pressure on a Plane - Virgin Atlantic
This is a quick video to show how the gas pressure on a plane is lower than atmospheric!
Derby County Show Digger Exhibition - Hydraulics in Action - JCB
This is great little video which shows the power of hydraulics in action. Amazing British construction.
Hydraulics in Action
Simple model to show how hydraulics work
Pressure in Syringe - Mechanical Advantage - Car Brakes - GCSE Physics - Hydraulics Work Done
Super quick video to show how the work done on a liquid is transferred through the liquid to make a change in force or distance moved by a piston. F1D1 ...= F2D2 what you gain on the force you lose on the distanceShow More Q4 and 5 5B SLG and 2C Elec and PD June 2018 iGCSE Physics
This is a quick video walkthrough of an Edexcel exam question. It is designed so you can look at questions which relate to questions from specific parts of the course.
It ...is taken from a real paper and I have used a real mark scheme which I have adapted for on-screen use. If you listen carefully it will give you a really good idea of what an examiner is looking for.Show More Q12 4B 4D Energy 5B Pressure June 2018 iGCSE Physics
This is a quick video walkthrough of an Edexcel exam question. It is designed so you can look at questions which relate to questions from specific parts of the course.
It ...is taken from a real paper and I have used a real mark scheme which I have adapted for on-screen use. If you listen carefully it will give you a really good idea of what an examiner is looking for.Show More Steel Floats on Liquid Mercury - Density
This shows how dense mercury really is as the steel block actually floats on top.
If you try this be aware that Mercury must be used in ventilated room, don't touch ...it or breathe in vapours.Show More Plane Cabin Pressure Pringles Can
Amazing look at how pressure on a plane is less than or is on the ground. 40,000 feet makes a difference.
This was a Ryan air plane!
Pressure on a Plane Bag of Crisps
Interesting effect when the pressure in a plane cabin drops below air pressure a normal bag of crisps inflates to be turgid. Here is one pack of crisps bought at ...Kos airport which has now gone very turgid.Show More Bed of Nails - "Right of Passage" - Pressure
A pupil gets onto a bed of nails showing that pressure is lower when the area is greater.
This was a very cool Physics demo. The student actually went onto become ...a Physics teacher as he passed this right of passageShow More Bed of Nails - Under Pressure - GCSE Physics Force/Area = Lower Pressure
This is so simple but also so cool.
Clearly the bed of nails spreads out the force which is massive from my hand and means that the balloon does not break.
A ...single nail causes all the damage!Show More Water Bubbles and Diving Pressure
This amazing video shows how a water bubble is under pressure at the bottom of a measuring cylinder.
Dimensions Cylinder - 570mm tall x 80mm diameter.
So you can time the ...rise if you work it out as a proportion of the cylinder.
Due to the increase in pressure the volume of air reduces in your tank and lungs when you dive. When you exhale from your regulator at depth that air is then exposed to pressure and as the air travels to the surface it will be exposed to less pressure so will your bubbles increase in size all the way to the surface.
If you hold onto your air it will expand inside your body and cause you damage!
This is called the "bends", the only way is to have breathing stops every few metres to exhale and exchange the dissolved gases.Show More Water Bubbles and Diving Pressure Slow Motion
This amazing video shows how a water bubble is under pressure at the bottom of a measuring cylinder.
Dimensions Cylinder - 570mm tall x 80mm diameter.
So you can time the ...rise if you work it out as a proportion of the cylinder.
Due to the increase in pressure the volume of air reduces in your tank and lungs when you dive. When you exhale from your regulator at depth that air is then exposed to pressure and as the air travels to the surface it will be exposed to less pressure so will your bubbles increase in size all the way to the surface.
If you hold onto your air it will expand inside your body and cause you damage!
This is called the "bends", the only way is to have breathing stops every few metres to exhale and exchange the dissolved gases.Show More Hydraulics: GCSE revision
GCSE level Classical Mechanics covering: Hydraulics
Hydraulics | GCSE Physics | Doodle Science
GCSE Science
Doodle Science teaches you high school physics in a less boring way in almost no time!
Follow me: https://twitter.com/DoodleSci
You can support me at: https://patreon.com/doodlescience
Script:
Hydraulics might sound complicated but all they ...are, is another force multiplier. They utilise the fact that liquids are virtually incompressible, which means when you compress them, the pressure you apply to one point of the liquid is transmitted equally in all directions.
For example if you have a balloon with a few holes in it and you squeeze the top of the balloon, the water will squirt out of all of the holes. This shows that the pressure applied at the top of the balloon must have been transmitted equally to all other parts of the liquid.
In order to work with hydraulics, the equation Pressure = Force/ Cross sectional area is needed. Where pressure is measured in Pascals, force in newtons and the cross sectional area in square metres. A hydraulic system works by applying a small force to one piston to produce a much larger force to a second piston. For example, if one piston has a cross sectional area of 0.001m^2 and a force of 15N is applied to it, then since the pressure is transmitted equally to the other piston of area 0.01m^2 then the force acting on the second piston is 150N
Hydraulic systems are used in all kinds of things such as car braking systems, car jacks and on the landing gear of some aircraft. All these applications take a small effort force and produce a large load. And it’s a good job too, because I wouldn’t want to change a tyre without hydraulics.
References:
1. http://www.bbc.co.uk/education/subjects/zrkw2hv
2. CGP GCSE Physics AQA Revision Guide.Show More Permanent link to this article: https://www.animatedscience.co.uk/igcse-physics-introduction-and-resources/5-solids-liquids-gases-part-a-units/5-solids-liquids-gases-part-b-density-pressure
