Lesson video

Hi, everyone.

My name is Miss Panchal and I'm really excited and glad you decided to join me on this science lesson.

So our lesson today is going to be focusing on examples of everyday evaporation and condensation.

So we're going to be looking at lots of different examples of evaporation and condensation that you'll see in your everyday lives.

Now, this lesson is part of our bigger unit of learning on an introduction to states of matter and changing states.

We've got lots of work to do today, so let's get started.

So the outcome for our lesson today is I can give examples of evaporation and condensation from real life.

So we're going to be looking at lots of different examples today.

So let's go over some keywords that we're going to use in our lesson today.

So we've got liquid, state, gas, evaporation, and condensation.

So what I'd like you to do is read through these keywords and definitions in your head really quietly.

And then once you've done that, I'd like you to take in terms of your partner to read out the definitions to each other.

Once you've done that, click play and we'll start the lesson.

Brilliant reading, everybody.

Well done.

So our lesson today is split up into two parts.

So the first part of our lesson is we're going to focus on evaporation in our everyday life.

And the second part of our lesson is going to be focusing on condensation in our everyday life.

So let's get on with the first part of our lesson.

Lucas says, "I got my socks wet when I was walking home in the rain.

My granddad told me to hang them on a rack and the next morning they were dry." What do you think has happened? So pause the video here.

Use your existing knowledge of evaporation to help you think about what has happened to Lucas's socks.

Pause the video, have a little think, and then share your ideas with your partner.

Excellent work, everybody.

Well done.

So Lucas's socks had been wet because they had absorbed water in liquid state.

So we've got a wet sock here, and overnight this water had changed into gas state.

So we can see the dry sock there overnight in the morning when he's looked at it and we can see that there is water vapour.

So this is an example of evaporation because we've got water in the liquid state and that has evaporated into the gas state.

Evaporation occurs when materials change from the liquid to gas state.

Can you think of any other examples? Pause the video here.

Have a think with your talk partner.

Can you think of any others? Brilliant job, everybody.

Well done.

So we're going to be looking at some further examples in our lesson today.

So let's do a check of our learning.

Why does wet clothing dry over time? Is it because a, the liquid water in the clothes condenses? Is it because b, the liquid water in the clothes freezes, or c, the liquid water in the clothes evaporates? Which do we think is the answer, a, b, or c? Super job.

The answer is c.

So the liquid water in the clothes evaporates.

Let's move on.

Lucas says The puddle in the school playground disappearing was an example of evaporation.

Puddles get smaller over the course of the day as rainwater evaporates, changing from the liquid state to the gas state.

And in the same way that puddles evaporate, wet surfaces, including floors, dry after we have cleaned them.

So, for example, once you've finished dinner, if you've wiped the table with a wet cloth, it's obviously wet when you first wipe it, but if you go back to it in the next hour or two, the water will not be there anymore because the water has evaporated.

Evaporation happens indoors and outdoors.

Sophia says, "In the summer, the water level in our pond goes down and we have to top it up with a hosepipe." Lucas says, "At the local swimming pool, they have to top up the water in the pool because some of it evaporates." So here are two examples of where evaporation happens in indoors, but also outdoors as well.

Let's do a check of our learning.

Why does the water level in ponds go down on dry days? Is it because a, the liquid water in the pond condenses, b, the liquid water in the pond freezes, or c, the liquid water in the pond evaporates? Which do we think is the correct answer? A, b, or c? Great job.

The answer is c.

So the liquid water in the pond evaporates.

Let's move on.

Animals, including humans, have adapted to make use of evaporation.

When we are hot, we produce sweat, and sweat is small droplets of liquid water, which we produce on our skin and body heat is used to evaporate the liquid water in sweat to cool our bodies down.

So our bodies produce sweat because our bodies realise that our body temperature is very high, and so in order to cool it down, our body produces sweat.

Some people use an understanding of evaporation to help them in their work.

Cooks use evaporation to help make tasty soups.

As they heat the food in a saucepan, water evaporates, leaving a thicker, stronger tasting soup.

So if a cook is starting to make a soup, it might be quite watery to start off with, but over time the water evaporates and leaves a much thicker soup.

So the liquid water has now turned into water vapour.

So the water was in a liquid state, but it's now in the gas state.

Let's do another check of our learning.

True or false, sweating cools us down because sweat condenses on our skin? Do we think that's true or false? Brilliant.

The answer is false.

Now, let's have a little think about why.

Why do we think this statement is false? Maybe you can have a chat with your talk partner.

Why is this statement false? Brilliant, so body heat is used to evaporate the liquid water in sweat to cool our bodies down.

Super job, everybody.

Well done.

Let's do another check of learning.

Over a few days of dry weather, what would you expect to happen to a puddle? Would it, a, it would get smaller, b, it would stay the same size, c, it would get bigger? So what would happen? Brilliant, it would get smaller, because the water would evaporate.

So let's move on to the first task of this lesson.

So I would like you to explain evaporation in one of the examples below, and I would like you to draw diagrams to help you with your explanation.

So you can choose one of the three examples, either the water level in a pond dropping, a puddle drying up, or cooking to thicken soups and sauces.

So choose one of those examples, or if you'd like to, you can choose your own example, and what I'd like you to do is explain evaporation.

And when explaining, I'd also like you to use a diagram to help you.

So a before and after diagram will be a great idea.

When you're doing an explanation, I want you to work really hard to try and use some keywords in your writing as well.

So pause the video here and have a go at this task.

You may decide to do this with a partner, or you can have a go on your own.

It's completely up to you.

Pause the video, have a go, and I'm really looking forward to seeing your work that you've produced.

Off you go.

Excellent work, everybody.

Well done.

I can see you've worked really hard to explain evaporation using one of these examples.

So this is an example answer.

So this chart here is chosen to use the water level in a pond dropping.

So we can see the before picture, the water level of the pond is quite high.

We can see after a certain amount of time, the water level in the pond has actually dropped and we can see some of the water has evaporated into water vapour.

So we can see the water level in the pond has dropped.

Liquid water has evaporated to become water vapour.

Now, did you use this example or did you use another one? Maybe you can compare your work with your partner or another group.

Well done for having a good go at this task, everybody.

I'm so impressed with your work.

So we've gone through some examples of evaporation in everyday life, and so we're now going to move on to condensation and looking at examples of condensation in our everyday lives.

So Alex had been outside on a cold day, and when he went back into the house, his glasses steamed up and he could no longer see through them.

What do you think has happened? So pause the video here and maybe if you wear glasses like me, maybe this has happened to you before.

Why do you think this has happened? Pause the video, have a think on your own, and then share your ideas with your talk partner.

Why has this happened to Alex's glasses? Brilliant ideas, everybody.

Well done.

So condensation occurs when materials in the gas state cool and change to the liquid state.

For example, Alex's glasses had become cold outside.

When he returned to the house, water vapour in the warm air touched his cold glasses and condensed forming liquid water.

So we can see an example here.

We've got Alex's glasses and we've got the water vapour, and we can see when he's come back, the liquid water is actually on his glasses.

Can you think of other examples of condensation? So pause the video here and think to all the different things that you do in your everyday life.

Think about from when you get up in the morning to when you go to bed at night.

Can you think of any other examples of condensation? Excellent ideas, everybody.

Well done.

So we're actually going to go through some more examples together now.

Before we do that, let's do a quick check of our learning.

Why does the cold glass in glasses steam up when entering a warm room? Is it because a, water vapour in the air evaporates off the cold glass, b, water vapour in the air condenses on the cold glass, or c, water vapour in the air melts on the cold glass? Which we think is the correct answer, a, b or c? Brilliant job, everybody.

Well done.

So the answer is b.

So water vapour in the air condenses on the cold glass.

Super job.

Let's move on.

Lucas says, "When I have a hot shower or bath, the bathroom walls and windows get water droplets running down them," and you can see a picture of them there.

Sophia says, "When we heat water in our saucepan, water condenses on the tiles behind the cooker." So here are some other examples of condensation in our everyday lives.

Lucas says, "I have been told that water vapour is invisible, but I think I have seen it above a kettle when it boils." Water vapour is invisible.

So the steam you see above the top of a boiling kettle is not actually a water vapour, but does anyone know what it is? What can we see? If we look at this image here, the steam above a kettle, so we know it's not actually a water vapour.

Does anyone know what it actually is? Brilliant ideas, everybody.

So actually, it's tiny water droplets formed as the water vapour cools and condenses.

So when you're boiling a kettle or making a hot drink, for example, or you see an adult making a hot drink, that steam you see above is not actually water vapour, it's actually tiny water droplets, and they're formed as the water vapour cools and condenses.

Let's move on.

Scientists learn about evaporation and condensation using observation and investigation.

In the past, scientists used observation to help them understand the weather.

Ancient Greeks like Aristotle described evaporation and noted that a water vapour from the sea could condense into clouds and form as rain.

Let's do a check of our learning.

Which process causes foggy mirrors, windows, and glasses? Is it a, evaporation, b, melting, c, condensation, or d, freezing? What do we think is the correct answer? Excellent job.

The answer is c, condensation.

So this is the process which causes the foggy mirrors, windows, and glasses.

So let's do a check of our learning.

True or false, water vapour condenses when water vapour touches a warm surface and down, changing into liquid water? Do we think that's true or false? Brilliant.

The answer is false.

But we now need to think a little bit about why.

So I'd like you to talk with your talk partner about why this statement is false.

Excellent.

So water vapour condenses when water vapour touches a cold surface and cools down, changing into liquid water.

Great job, everybody.

Well done.

Let's do another question to check our learning.

Which professionals try to learn about evaporation and condensation using observation and investigation? A, teachers, b, scientists, c, builders? Which do you think is the correct answer? Excellent, the answer is b, scientists.

So let's move on to the next task.

The children are looking at a can of fizzy drink on a hot day.

They notice water droplets running down it and a small puddle next to it.

Lucas says, "It must have been raining earlier." So we can see the can of drink there with the water droplets on it.

Alex says, "Water vapour in the warm air turned into drops of water on the cold surface of the can." And Sophia says, "It must have a leak." Explain who you agree with and why.

So we can see here all three children have said something about why there are water droplets on the outside of the can.

So I would like you to think about who is correct, who do you agree with, Lucas, Alex, or Sophia? Once you've decided on who you agree with, I'd like you to tell me why.

So you can either write down your ideas in a paragraph, or you could record yourself explaining who you think is correct or who you agree with and why.

Pause the video here, have a go at this task, click play when you're ready to continue and we'll go through the answer.

Off you go.

Super job, everybody.

Well done.

So the children were looking at a can of fizzy drink on a hot day and they notice those water beads are running down it and a small puddle next to it.

So there were three children and they said three different things.

So actually, Alex is correct.

So water vapour in the warm air turned into drops of water on the cold surface of the can.

So Alex here has actually described the process of condensation.

So this is another example for how we can see condensation in our everyday life.

Did you get the same answer as this? Well done for having a good go at this task, everybody.

So we've come towards the end of our lesson.

So let's do a summary of our learning.

So everyday examples of evaporation can include puddles disappearing and wet clothing drying.

Everyday examples of condensation can include foggy mirrors, windows, and glasses.

Scientists learn about evaporation and condensation using observation and investigation.

So in our lesson today, we've looked at lots of different examples of evaporation and condensation that you'd see in your everyday life.

So maybe next time it's a wet morning when you're at school, for example, and you see some puddles and you notice at the end of the day the puddles disappeared.

You can maybe explain to a friend or a cousin or a sibling where that water has gone, and next time it's very cold outside and you're having a nice hot shower.

You can see there's water droplets on the tiles and then you can maybe explain to somebody at home why that is happening.

Super job for all of your work today.

I'm so impressed with all of your ideas and you've engaged really well with all the questions and the tasks.

I hope you have a great rest of the day and I'm sure I'll see you really soon in the next science lesson.

Bye-Bye.