How does a
hot air
balloon fly?
Homework IN: Home work on expansion of ocean’s waters
Homework OUT:
Date: 9th December
Title: Density of Gases
Objective: Why aren’t all gases the same density?
Learning Outcomes
Grade
Key Words
All
Describe density
4
Density
Mass
volume
Most
Use the particle model to explain
differences in the densities of gases
5
Some
Evaluate a method for measuring density
6
Numeracy
Literacy
SMSC
Density in gases. Which is
more dense?
Density of gases
tryitloveit.co.uk
Hot air is less dense than cold air
Hot air rises
Density of gases
science.howstuffworks.com
The particles in cold air are closer together
and so it is denser than hot air.
Density
Have a look at
the helium
balloon and the
normal balloon
Is helium more or less
dense than air? How do
you know?
Can you explain how the
helium balloon floats
upwards?
Who has
seen the
film Up?
Who thinks
it is possible
to fly a
house?
https://www.youtube.com/watch?v=rV6rNqin4P
8
The real Up! Scientists recreate floating house from Pixar movie...
and prove it really CAN fly!
Lets
take a
look!
Using 300 helium-filled weather balloons, a team of scientists,
engineers, balloon pilots and volunteers, they managed to get the
small house 10,000 feet into the air.
Of course it was not a real house, but a custom-built light weight
one.
The executive producer said: 'We found that it is actually close to
impossible to fly a real house but what we can do is kind of fly a
light-weight house and fly it safely with people on board.'
Each of the balloons were eight-feet high and filled with a whole
tank of helium.
As well as getting the house to fly, they set a world record for
largest cluster balloon flight ever attempted.
The 4.8m x 4.8m x 5.5m house flew across California's High
Desert for about an hour with two people inside, just like the
Disney Pixar film.
Starter:
Write to a year 6 student
and give them a scientific
answer to the questionCan a house fly like in the
movie Up?
Use the words
Helium, Gas, Higher
Density, Lower Density,
Rise, Hot air, Cold air