3.2 Temperature
Chapter 3.2 Temperature
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Slide 1: Slide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2
This lesson contains 27 slides, with text slides.
Lesson duration is: 45 minItems in this lesson
Chapter 3.2 Temperature
Slide 1 - Slide
Schedule for this lesson
Explanation about the new paragraph
Making question in the workbook
Recapping the last 2 paragraphs
Slide 2 - Slide
Learning objectives
You can describe how you can measure the temperature of te air around you
You can list the parts of a liquid thermometer
You can explain how a liquid thermometer works
You can describe a digital thermometer
You can explain what the measurment range of a digital thermometer is
You can give a thermometer a graduated scale in degrees Celsius using the melting point of ice and the boiling point of water (experiment?)
Slide 3 - Slide
Measuring the temperature
Your perceptions of heat and cold are not that reliable when it comes to measuring temperatures
When your fingers are cold things could feel warmer than they really are
And when cycling through the wind, it seems a lot colder than it really is, even though the temperature stays the same
Slide 4 - Slide
Measuring the temperature
A thermometer lets you measure the temperature
of the air around you
This gives the temperature a value that is the same for everyone
So one might think it is really cold, while someone else thinks it's nice and fresh outside
Slide 5 - Slide
Measuring the temperature
If you hang a thermometer directly in the sun, its shows a higher
temperature than the outside air (just like how our skin feels
warmer when we sit in the sun)
When a cloud moves in front of the sun, the temperature will fall
A thermometer that in hung up in the sun can not give the right value for the air temperature
Slide 6 - Slide
Measuring the temperature
This is why meteorologists hang their thermometers
up 1,5 m above the ground
They have these weather station huts with open walls so the wind can pass through
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The liquid thermometer
A well-know type of thermometer is the liquid thermometer which consist of 3 parts
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The liquid thermometer
The reservoir and part of the riser capillary are filled with a liquid (this liquid is alcohol with an added dye in most thermometers)
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The liquid thermometer
When the temperature increases, the liquid in the reservoir expands. This will push the level of liquid in the cappilary tube up.
When the temperature decreases, the liquid contracts and the liquid level falls
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The liquid thermometer
You read of the temperature by comparing the height of the liquid in the capillary tube against the graduated scale next to it
The difference between the highest and lowest temperature that can be measured is known as the measurement range
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The liquid thermometer
Most of the thermometers we use in our daily life have the temperature measured in degrees Celsius
There are a few different units in which temperature can be measured, do you maybe know one of them?
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Kelvin
Kelvin (K) is a bit of a weird unit, but the unit we use most to define temperature in physics
We are able to convert the temperature in Celsius to Kelvin
0 degrees Celsius = 273 Kelvin
20 degrees Celsius = 293 Kelvin
-10 degrees Celsius = 263 Kelvin
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Kelvin
Kelvin is a unit which has an absolute zero
Which means it can´t get any lower than 0
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The digital thermometer
Digital thermometers use a smaller scale to measure temperatures
The digital thermometers you use when you
are sick don´t need to measure temperatures
below 35 or above 43 degrees celsius
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The digital thermometer
While other digital thermometers could have different ranges
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Making question 3.2
Make the following questions: 1, 2, 3, 4, 5, 6 and 7
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What did we learn today?
In today's lesson we talked about temperature
How we all feel temperature differently and need a thermometer to know what the temperature really what
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What did we learn today?
We talked about different kinds of thermometers and their parts
And we know what Kelvin is
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Small recap
What are the 3 phases in which a substance can occur?
- Solid
- Liquid
- Gas
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Small recap
Which phase do we see in the picture below?
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Small recap
Which phase do we see in the picture below?
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Small recap
According to the particle model, how are the molecules moving in a solid substance?
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Small recap
According to the particle model, how are the molecules moving in a solid substance?
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Small recap
How do we measure the temperature outside?
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Small recap
How does a liquid themometer work?
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End of the lesson
