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Good morning, boys and girls. How are you today? I hope that everyone is okay and ready for a new

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natural science class. So today we are going to talk about water. So if you have your book,

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you can open your book on page 8 and 9. And if you are going to use the digital version of the book,

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you can open this book on pages 80 and 81 okay so let's going to talk about water as i said

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water is an example of matter and water has three main characteristics so let's going to see

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the characteristics so water is odorless tasteless and colorless oh these words are very

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difficult and new for us. So, let's go into explain these words little by little and step

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by step. The first one, odorless. Let's go into see the meaning of odorless. Odorless

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means no smell. So, if you take a glass of water and you smell this glass of water, you

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can see that there is no smell so water is odorless okay so no smell if you have

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also in the kitchen the possibility to smell a glass of orange juice you can

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see the difference so please if you can take a glass of water and a glass of

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orange juice you can see the difference right now. Let's going to analyze the

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second word tasteless so tasteless is means no taste so if you have your

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glass of water and you drink a little bit of this water you can see that is no

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or you can feel that it's not salty or it's not sweet so the taste is nothing

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so no taste for water and if you have your glass so for orange juice for example

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you can see that this the taste is orange

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so the taste the taste is different between the orange juice and water and finally colorless maybe

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the easiest word so means no color so as you can see if you have your glass of

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water is transparent is no color on it and if you see the glass of orange juice

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obviously is orange so as a review as a quick review the three main

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characteristics of water are odorless tasteless and colorless okay so it's going to continue

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and we can find water in the three states of matter so this means we can find water

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solid solid water we can find liquid water and we can find gas water okay even in at home it is easy

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to find the three states of water so let's going to see the main characteristics of water is in a

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gas state at temperatures over 100 degrees this means that the temperature is more than 100 okay

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over the word the word over means more than 100 okay so imagine if you are helping in the cook

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in the kitchen and you put some water on the fire and you can see some vapor is because this water

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is over 100 degrees so this water is getting into gas okay

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next so water is in a liquid state between 1 degree and 99 degrees okay so this is the

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most common state of water so if you open the tap you can find liquid water

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okay and finally water is in a solid state at temperatures below 0 degrees so

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below means less than 0 okay so if you put some water into your freeze in the

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kitchen you can have solid water. The last part of the class is about the

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changes of a state in water. So here we have solid water and if we want to

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transform this solid water into a liquid we need to heat the solid water, we need

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to heat this solid water to change into liquid water so this process when solid

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water changes into a liquid water it will melt so the water melts okay then

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if we want to change liquid water into vapor water also we need to heat the

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liquid water okay here we have the water vapor so we need to heat liquid water and it changed into

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water vapor and this process is we say that water evaporates and also we do we can do the other way

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around we can transform water vapor into a liquid we can see in a minute okay so when we

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cold we need coal when we call water vapor here we are when we call water vapor

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what this water vapor transforms into liquid and this process we say that water it condenses

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And finally, if we cold liquid water, this water changes into a solid and this process, in this process, water freezes, water freezes, okay?