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CCSS.Math:

what I want to talk about in this video is the leader the litre let me write this down the leader and the leader is a unit for measuring fluid volume so how much space does a fluid take up so what does one liter look like well one of these milk bottles is a liter and your most typically going to think about a liter in your everyday life when you're buying some type of beverages milk or water in fact next time you go to the grocery store see a lot of the a lot of the bottles you get they might be exactly one liter some of the soda bottles are two liters but this right over here is one 1 liter we'd write a capital L for short that's one liter and so there's six liters in total in this little carrying case but each of these milk bottles is one liter so that's a leader but what if we want to go to really small volumes of water well if we want to go to really small volumes of water we normally talk about milliliters milliliters let me write this down mili mili mili liters actually let me write it this way we write mili in another color mili mili liters so it's a mili liter and a mili liter a mili is a prefix that you'll see a lot when you're using units and that means one one thousandth of a liter so this means one one thousand one one thousandth of of a of a liter and the notation for milliliter is a lowercase M and an uppercase L mili liter another way to think about it it would take 1,000 milliliters to get to one liter so what does a milliliter look like well if you imagine these medicine droppers a milliliter would be about that high on one of those medicine droppers and a lot of these medicine droppers actually will have a milliliter actually they'll have up to five milliliters marked off but a milliliter would be about that much or if you were to take a teaspoon from your cabinet in your kitchen and you were to scoop out a teaspoon of water that so this one over here is going to be about one milliliter and a teaspoon of fluid that's going to be about five that's going to be about five milliliters so another way to think about it is you would have to take a thousand of these drops to fill one of these one of these bottles of milk a thousand milliliters to get to one liter or you would have to do let's see five you'd have to put five sorry you would have to do 200 teaspoons of say milk to fill up this entire thing because each of them is five milliliters 200 times five milliliters you're going to have a thousand milliliters which is one liter let me write this down this right over here this is one liter which is the same thing as one thousand 1,000 milliliters now what if we go to what if we go to things that are much larger what if we go to things that are much larger than the scale of a of a jar of milk say a swimming pool and this right over here this is a picture of a Olympic sized swimming pool which is for the most part the the largest pools well there are some larger pools at some fancy hotels and things but there are very large pools so what do you think would be if if one milk bottle has a one like this has a fluid volume of 1 liter or do you think about a whole swimming pool well actually a swimming pool like this if it is 25 meters wide and 50 meters long and 2 meters deep it actually would have a fluid volume are you ready for this it would have a fluid volume of 2.5 million 2.5 million liters so if you fill this up with milk you could use that milk to fill up 2.5 million of these bottles so that's just an appreciation for just how much fluid it would take to fill up at least a big swimming pool like this an Olympic sized swimming pool a swimming pool that you might more typically see at someone's house who isn't you know that doesn't have an Olympic sized swimming pool so kind of a house sized swimming pool is still going to be it's not unusual to see one that'll be more than one hundred 100 thousand one hundred thousand liters so once again are you thinking about your teaspoons or drops of from a dropper you're thinking in the milliliter range if you're thinking about the type of something that you might drink in a day or that your family might drink over say a week you're thinking in really the leader range and if you're thinking about how much how much fluid it would take to fill a swimming pool now you're talking in the tens of thousands or hundreds of thousands or even millions of liter range