The first thing we’re going to look at are
the two formulas you will need for temperature conversion. Both of these formulas are on
the card I gave you in class. The first is the formula if we want to change Celsius temperature
to Fahrenheit temperature. Notice that it says F equals so we’re looking for Fahrenheit
temperature. The second would be if we’re given Fahrenheit and want to find Celsius.
We’ll do a couple of practice problems just to make sure you know what you’re doing. The
thing you need to be careful with on these is your order of operations. Make sure you
do this problem with me and actually get the answer that I get. For the first one, let’s
say we want to change 6 degrees celsius to fahrenheit. That would mean we would use the
first formula because we’re trying to find Fahrenheit, so we would plug 6 in place of
the C in the formula. Since they’re sitting side by side, it means multiplication, so
we would take our calculators and punch in 1.8 times 6. We would hit enter or equals
on our calculator and then add the 32. We should get 42 point eight degrees Fahrenheit.
That’s the first one. Let’s try the next one. This is the formula if you want to find Celsius.
Let’s say we had 70 degrees Fahrenheit and want to change it to Celsius. We would take
our 70 and plug it in our formula. This is the one people tend to miss, just because
they don’t follow the order of operations or they don’t hit enter on their calculator.
You need to punch in 70 minus 32, get an answer, which is 38. Take the 38 and divide it by
1.8. You would get 21 point one degrees Celsius. You need to make sure you can do both of these
problems with me and get the correct answer. The other thing we haven’t really looked at
in class yet is the US to Metric conversion. This is going to be exactly like what you’ve
already done. Just notice that on the metric chart you actually have two options to look
at here. You have one where you have on the left, you have things like an inch equals
2.540 centimeters, but on the right you have one centimeter equals .3937 inches. It does
not matter which one of these you want to use. You can use either one you want to. Your
answer may be slightly different, depending on the one you choose to use. Let me show
you that in an example problem. Let’s say we want to change 25 inches to centimeters.
We look at our chart and we see that one inch equals 2.540 centimeters. We also see that
one centimeter equals 0.3937 inches. Now, that mans you have two choices. When I set
up my problem, just like we did the others and take my 25 inches and put it over one,
I have to choose which one of these units I want to use. I can use either one I want
to, but the thing I have to remember, is that whatever is on the top has to go on the bottom
to make it cancel. If I choose to use the top one, I’m going to put one inch down here
and 2.540 centimeters up here to make the inches cancel. I would do my math and have
25 times 2.540 centimeters. I would get 63.5 centimeters. If I choose to go the other route,
I have to put 0.3937 inches on the bottom to make inches cancel. that’s equal to one
centimeter, so inches cancel. Mathematically, I have to do 25 times one divided by 0.3937.
If I do that on my calculator, I end up with 63.500127 centimeters. You can see the answers
are slightly different, but it’s not enough to make a huge difference. You can use either
one of those that you want to. Just pay attention to what you’re using on your chart. Set these
up just exactly the way we’ve done them before, in class.