1
00:00:00,940 --> 00:00:07,940
Hello, I've been reading your work this weekend and I can see that you have some difficulties with some conversion factors.

2
00:00:07,940 --> 00:00:13,939
So I'm going to teach you how to do this. They were the most difficult in the set of activities.

3
00:00:13,939 --> 00:00:18,940
I'm going to start with this one. The problem about this one is that it has three units.

4
00:00:18,940 --> 00:00:24,940
So we have micrometers, we have grams, we have seconds.

5
00:00:24,940 --> 00:00:30,679
And we need to change from micrometres to centimetres, from grams to kilograms, and from seconds to hours.

6
00:00:31,000 --> 00:00:32,899
So we are going to need three conversion factors.

7
00:00:33,560 --> 00:00:38,520
The first one, I'm going to change from micrometres to centimetres.

8
00:00:38,899 --> 00:00:41,439
OK, so I do the same as always.

9
00:00:42,159 --> 00:00:50,619
But firstly, I need to remember, I need to know, how many centimetres in a micrometre.

10
00:00:50,619 --> 00:01:01,119
So if you remember the submultiples, the centi is here, the micro is here, and this is 10 to the power minus 6.

11
00:01:01,500 --> 00:01:05,180
So there are like four steps between micro and centi.

12
00:01:05,400 --> 00:01:12,379
That means that one centimeter is 10,000 or 10 to the power of 4 micrometer.

13
00:01:12,819 --> 00:01:15,939
OK, so with this, we have this first change.

14
00:01:15,939 --> 00:01:19,640
Now we're going to the second one is grams to kilograms.

15
00:01:19,640 --> 00:01:29,739
grams here, kilograms here. And this is easy, 1 kilogram is 1000 grams. And finally we need

16
00:01:29,739 --> 00:01:37,739
to change from seconds to hours. Seconds are here, remember that they are below the line,

17
00:01:37,739 --> 00:01:48,260
so over the line here, and hour is 3600 seconds. Now the only thing I need to do is to use

18
00:01:48,260 --> 00:01:56,180
my calculator to find out and multiply this by this and divide by this and I

19
00:01:56,180 --> 00:02:05,200
have the final result okay now I'm going I'm going with this and I have to

20
00:02:05,200 --> 00:02:09,939
remember that one liter is one cubic decimeter it's the same so I'm going to

21
00:02:09,939 --> 00:02:14,919
write the first unit with cubic decimeters and cubic and square

22
00:02:14,919 --> 00:02:21,759
centimeters okay and firstly I'm going to change from cubic decimeters to cubic

23
00:02:21,759 --> 00:02:28,419
meters one meter is 10 meters but it's cubed and now I'm going to change this

24
00:02:28,419 --> 00:02:33,259
is the first change now I'm going to change from giving decimeters to giving

25
00:02:33,259 --> 00:02:40,080
me sorry for square decimeters to square meters so decimeters to meters remember

26
00:02:40,080 --> 00:02:47,039
they are here and they are square one meter is 30 meters and it's square okay

27
00:02:47,039 --> 00:02:56,379
So this cancel this, this cancel this, and all I have to do is multiply by 100 and divide by 1000.

28
00:02:56,919 --> 00:02:58,960
So this is the final result.

29
00:03:02,639 --> 00:03:06,539
Okay, I hope it helps to prepare for your exam, for your quiz.