Hello, my name is Mrs. Merin and I'm so excited to be learning all about thermometers and data loggers with you.

Welcome to today's lesson from the unit, "Introduction to States of Matter and Changing States." Your lesson outcome is "I can measure and record temperature in different ways." Now I know that learning can sometimes be a little bit challenging, but that's okay because it just means that we are going to work really hard together and we're going to learn lots of fabulous new things.

Let's begin.

So here are your five keywords for today's lesson.

I also have the definitions here along the side.

Now you don't need to jot these down, however, if you find it helpful, you can pop the video on pause and jot them down now.

Off you go.

Fantastic, well done.

So your lesson today is split into two parts.

Let's begin with the first part, using a thermometer to measure temperature.

Alex is feeling unwell.

His mom asks him, "Do you have a high temperature?" Alex knows that when his mom says this, she wants to know if he is too hot.

Temperature is the amount of heat in something and it's the same for example, if you ask what the temperature is like during the day.

So you might be trying to find out how hot or how cold something is or how hot or cold the weather is on that particular day.

So Alex doesn't know if he is too hot.

How do you think he could find out? What could Alex do in order to find out if he is too hot? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So Alex's mom could use a thermometer to measure Alex's temperature.

A thermometer is an instrument for measuring temperature and it looks a little bit like when you're measuring the temperature on a child or on a person, you might use a temperature thermometer, which is similar to the one in this picture here.

Now some people have thermometers in their homes or gardens to measure the air temperature.

And we can also use thermometers to check the temperature of our bodies, but they do look different.

Now to take someone's temperature, we position the thermometer on the forehead like the one here in this picture.

Or you might have one which you can pop under your armpit, inside your ear, or under the tongue.

And they do look slightly different from each other.

Now let's do a quick check-in of your learning so far.

So it says temperature is a measure of how something something is.

So what would go in that blank there, where that black line is? So temperature is a measure of how something is.

Is it A, solid B, hot or C, colourful? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

The answer is hot.

Now scientists take accurate measurements using a range of scientific equipment, and here, we have a scientific thermometer in a flask.

Now many use thermometers in their work to measure and compare temperatures.

Have you ever used a thermometer? I'll give you five seconds to have a little think.

Off you go.

Fantastic, well done.

So if you have used a thermometer, or even if you haven't used one, do you have any idea about how they might work? Again, I'll give you five seconds to think about your answer.

Fantastic, well done.

So a thermometer is made of a narrow glass tube, which is sealed at both ends, just like in this picture here.

And the tube contains a coloured liquid.

And you can see the coloured liquid in this thermometer is red, and it has a scale written up the side.

The scale is the numbers that you can see here.

And if the temperature gets higher, the coloured liquid inside the thermometer expands.

So the top of it rises up the tube.

Isn't that clever? So the number next to the top of the coloured liquid is the temperature.

So in the UK, degrees Celsius is the unit of measurement for temperature, which is often shortened to this symbol here, where you've got a little circle and a C next to it.

Now what temperature is this thermometer showing? So have a really good look at that scale.

Think about which numbers you can see and have a little think about what those little lines and that big line might mean.

So I'll give you five seconds to have a really good think about what that temperature is showing.

Off you go.

Fantastic, well done.

So the thermometer is measuring 18 degrees Celsius, and the higher the number, the higher the temperature.

So Alex's mom takes Alex's temperature in degrees Celsius using a thermometer, and she says, "Your temperature is 39 degrees Celsius." This is higher than the average body temperature of around 37 degrees.

Now let's do a quick check-in of your learning.

So what is used to measure temperature? Is it A, a ruler, B, a compass, C, a thermometer, or D, a metre? Okay, I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

The answer is C, a thermometer.

So do you know how to use a thermometer to measure the temperature of water in a beaker? So you have to have your eye level with the height of the liquid in the thermometer.

So the first is you need to get right down and get down to the height of the liquid in the thermometer, rather than looking from above.

So in the second picture, if you are looking down from above, you are not going to get the right reading.

So you need to get down and look at the reading and get eye level with the height of the liquid.

You need to keep the thermometer in the water while it's taking the temperature.

If you lift it out to read it like the second picture here, if the water in the cup was quite hot, as soon as you pull it out, the thermometer temperature is going to drop rapidly.

Or you might have really cold water in the cup.

And when you lift it out because the air will be hotter than the cup of water, the temperature would start to rise.

So you're not going to get an accurate reading.

So you must keep the thermometer in the water at all times and get down to eye level.

Now allow time for the coloured liquid to stop moving before you take your reading.

So remember, you're gonna get, have your eye level with the height of the liquid.

So getting right down and having your eyes level with the height of the liquid and ensuring that the thermometer is inside the liquid and wait for that coloured liquid to stop moving before you take your reading.

So Alex says, "How can I measure the temperature of a room?" I don't know which object the thermometer should touch.

So to measure the room temperature, you need to hold the thermometer in the air.

And air has a temperature, and even though we can't see it, it is touching the thermometer.

So let's do a quick check-in of your learning.

It says, what is the unit of measurement for temperature? Is it A degrees Celsius, B, degrees, or C, Celsius? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

The answer is A, degrees Celsius.

So here is your first task for today.

It says, practise using a thermometer.

So I want you to measure and record the temperature of the air in the room, measure and record the temperature of cold water in a beaker, and measure and record the temperature of warm water in a beaker.

So I'd like you to pause the video here and have a go at doing this activity.

Off you go.

Fantastic, well done.

So remember, you are practising measuring and recording the temperature of the air in the room.

So in our classroom it's 22 degrees.

Measure and record the temperature of cold water in a beaker so the cold water in a beaker is 15 degrees Celsius and measure and record the temperature of warm water in a beaker.

The warm water in a beaker was 32 degrees Celsius.

So here is your second task for today.

It says, "What is the temperature reading in degrees Celsius shown on these thermometers here?" So again, I want you to pause the video here and have a really good look at this.

Off you go.

Fantastic, well done.

So the first one was 44 degrees Celsius, the second one was 37 degrees Celsius, and the last one was 33 degrees at Celsius.

So now we are onto the second part of our learning, which is using a data logger to record temperature.

So Sophia noticed that when she arrived at school, the classroom felt very cold, but that it had warmed up over the day.

And Sophia says, "I have to wear my jumper in the morning, but not in the afternoon." And Sophia wants to know how the temperature in the classroom changes during the day.

So how could she do that? I'll give you five seconds to think about your answer.

Off you go.

Fabulous, well done.

So Sophia plans to use a thermometer to measure the temperature of air in the classroom every half an hour over the course of the day.

And she says, "That will be a lot of temperature measurements for me to take and record." Do you think there is an easier way for Sophia to collect this data? What do you think? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So Alex says you could use a data logger.

Do you know what a data logger is? Again, I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So a data logger is an electronic device, which records measurements, and they can be used to record data about changes in light, sound, and temperature.

So data loggers have sensors attached to them that can monitor and measure different things, and the sensor with this data logger measures the temperature and the data logger records the measurements.

So which of these can a data logger be used to record data about? Is it A, light only, B, sound only, C, temperature only, or D, all of the above? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

The answer is all of the above.

So Sophia says, "I can't see a scale on the therm, on the temperature sensor like a thermometer.

How do I know what the measurement is?" Well, the reading is displayed on the screen of a data logger.

So it says here that the data logger has recorded a temperature of 25 degrees Celsius.

Now Alex uses the data logger to record the temperature of water and he plugs the temperature sensor into the data logger.

Next, he puts the temperature sensor in a beaker of water and waits for the reading on the data logger in, waits for the reading on the data logger in degrees Celsius.

So let's do a quick true or false before we move on.

So data loggers measure temperature.

Is that true or false? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

The answer is false.

Now let's see if you can justify your answer.

Is that because A, a temperature sensor measures temperature and a data logger records the temperature data or is it B, a data logger measures temperature and a temperature sensor records the temperature data? I'll give you five seconds to think about your answer, but if you need a bit longer to have another read of those sentences, just pop the video on pause and then come back once you are ready.

Off you go.

Fantastic, well done.

The answer is A, a temperature sensor measures temperature and a data logger records the temperature data.

So here is your second task for today, and it says, "Practise using a data logger and temperature sensor." So I want you to measure and record the temperature of the air in your classroom, measure and record the temperature of cold water in a beaker, and measure and record the temperature of warm water in a beaker.

And then I want you to compare your measurements with those from task A.

So I'd like you to pop the video on pause now and have a go at doing this.

Off you go.

Fantastic, well done.

So here with the thermometer, we recorded that the air in the room was 22 degrees, but the data logger said it was 23.

The cold water, the thermometer said 15 and the data logger said 18.

32 degrees for the warm water using the thermometer and then 30 degrees for the data logger sensor.

Now the temperature reading should have been close to those from task A, but may not have been identical because the air temperature is being measured at a different time and the water in the beakers might have warmed up or cooled down since the first reading.

So your results may have looked slight, similar to this or even slightly different.

So now we are on to the summary of your learning today.

So temperature is a measure of how hot something is.

A thermometer is an instrument that measures temperature.

In the UK, degrees Celsius is the unit of measurement for temperature, which is often shortened to this symbol here, where you've got a small circle and then a C.

Data loggers can be used to monitor and record changes in light, sound, and temperature.

Well done for today.

I hope you've enjoyed using your thermometers and your data loggers and that you have learned lots of fab new things.

Well done.