Everything Science Grade 10

1.3 CHAPTER 1. SKILLS FOR SCIENCE

QUESTION

Convert 4,56 kg to g.

SOLUTION

Step 1:Find the two units on the conversion diagram.

Use Figure 1.2. Kilogram is the same as kilometre and gram is the same

as metre.

Step 2:Decide whether you are moving to the left or to the right.

You need to go from kg to g, so it is from right to left.

Step 3:Read from the diagram what you must do and find the answer.

4 , 56 kg×1 000 = 4 560g

Two other useful conversions

Very often in science you need to convert speed and temperature. The following two rules
will help you do this:

1 .Converting speed

When converting km·h−^1 to m·s−^1 you multiply by1 000and divide by3 600

(^10003600 ms). For example 72 km·h−^1 ÷ 3 ,6 = 20m·s−^1.

When converting m·s−^1 to km·h−^1 , you multiply by3 600and divide by1 000

( 10003600 ms). For example 30 m·s−^1 × 3 ,6 = 108km·h−^1.

2 .Converting temperature

Converting between the Kelvin and Celsius temperature scales is simple. To convert

from Celsius to Kelvin add 273. To convert from Kelvin to Celsius subtract 273.

Representing the Kelvin temperature byTKand the Celsius temperature byT◦C:

TK=T◦C+ 273

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