kj to j
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this video is all about units of heat energy were gonna talk about how to convert from one unit to another so lets work on his problem convert 500 joules into calories now he needs another conversion factor 1 calorie is 4.184 joules so given that information how can we convert jewels into calories so start with what youre given in that case thats 500 joules now in the next fraction you want to put the unit joules on the bottom so that its gonna cancel so theres 4.184 joules for each calorie so all we need to do in this example is simply take 500 and divided by 4 point 9 84 so the answer is 1 19.5 calories thats equal to 500 joules now lets work on the second example
how many food calories are equivalent to 750 kilojoules of heat energy so we need to convert kilojoules into food calories which is different than the other calories that we will talk about in this case its a capital C so what I think we should do is convert kilojoules to joules and then joules to lowercase calories and then lowercase calories to capital calories so lets start with 750 kilojoules so to convert kilojoules to joules they need to know the conversion factor one kilojoule is equal to one thousand joules so thats the first thing that you need to know so Im gonna put one kilojoule on the bottom and the thousand joules on top so that these units cancel now based on the last example we know that one
lowercase calorie is 4.184 joules so Im gonna put joules in the bottom and then one calorie on top now the last conversion that we need is that one food calorie is a thousand lowercase calories so we could put that on the bottom here now we have a thousand on top and on the bottom so we could just cancer those two numbers a thousand divided by thousand is one so its just gonna be 750 divided by four point one 84 and so 750 kilojoules is equal to one hundred seventy nine point three food calories so lets try this one a certain cheeseburger contains 700 food calories how many joules of chemical energy has stored in this food so go ahead and try this from so we need to
convert food calories to lower case calories and then we could convert that to joules so we have 700 food calories and one food calorie is a thousand calories and one calorie we know its 4.184 joules and so thats how we can convert it so its gonna be 700 times 1,000 times four point one eighty four so one cheeseburger has two million nine hundred twenty eight thousand eight hundred joules of chemical energy stored into it thats a lot of energy to burn and so thats the answer now lets work on one more problem a certain snack bar contains 15 grams of fat if one gram of fat is equivalent to nine food calories how many joules of chemical energy is stored in the 15 grams of fat so
the grams of fat we need to convert it to food calories and then we could convert that to calories and then convert it to joules so if you want to try the problem feel free so one snack bar has 15 grams of fat and we have a conversion factor between grams of fat and food calories now we know that one gram of fat contains nine food calories and so we could cancel these two units and one food calorie is equal to a thousand calories and one calorie is 4.184 joules so lets go ahead and get the answer so its gonna be 15 times nine times a thousand times 4.1 84 and so this is gonna be five hundred sixty-four thousand eight hundred forty jewels and so thats it
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