Difference between pages "Milligram" and "Significant Figure"

Revision as of 13:51, 5 April 2019

Key Stage 4

Meaning

Significant Figures are the number of digits representing the accurate value of a number.

About Significant Figures

Significant Figures begin with the digit representing the largest number.

A number may be correct to a given number of significant figures.

The number of significant figures is related to how resolution of a measuring instrument.

When performing a calculation the answer should never be given to more significant figures than the numbers used in the calculation.

Examples

π = 3.14159265359 correct to 12 significant figures.

π = 3.142 correct to 4 significant figures.

The diameter of Earth = 12,742,000m correct to 5 significant figures.

The diameter of Earth = 12,700,000m correct to 3 significant figures.

The diameter of Earth = 10,000,000m correct to 1 significant figures.

@@ Line 1: / Line 1: @@
 ==Key Stage 4==
 ===Meaning===
-A [[milligram]] is a [[unit]] of [[mass]] which is 1000,000 times smaller than the [[SI Unit]] for [[mass]], the [[kilogram]].
+'''Significant Figures''' are the number of digits representing the [[accurate]] value of a [[number]].
-===About Milligrams===
+===About Significant Figures===
-: A [[milligram]] is shortened to a lower case m with a lower case g '''mg'''.
+: '''Significant Figures''' begin with the digit representing the largest number.
-: [[Milli]] refers to one thousandth as there are one thousand [[milligram]]s in a [[gram]].
+: A number may be correct to a given number of '''significant figures'''.
-: A [[milligram]] is 10<sup>-6</sup> [[kilogram]]s.
+: The number of '''significant figures''' is related to how [[resolution]] of a [[Measuring Instrument|measuring instrument]].
-: [[Milligram]]s are usually used to describe doses of [[drug]]s.
+: When performing a calculation the answer should never be given to more '''significant figures''' than the numbers used in the [[calculation]].
-===Converting to Milligrams===
+===Examples===
-{| class="wikitable"
+π = 3.14159265359 correct to 12 '''significant figures'''.
-|-
-| style="height:20px; width:200px; text-align:center;" |'''Unit'''
+π = 3.142 correct to 4 '''significant figures'''.
-| style="height:20px; width:200px; text-align:center;" |'''To convert'''
-| style="height:20px; width:200px; text-align:center;" |'''Milligrams'''
+The diameter of [[Earth]] = 12,742,000m correct to 5 '''significant figures'''.
-|-
-| style="height:20px; width:200px; text-align:center;" |1 megagram (1Mg)
+The diameter of [[Earth]] = 12,700,000m correct to 3 '''significant figures'''.
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x10<sup>9</sup>.
-| style="height:20px; width:200px; text-align:center;" |1x10<sup>9</sup>mg
+The diameter of [[Earth]] = 10,000,000m correct to 1 '''significant figures'''.
-|-
-| style="height:20px; width:200px; text-align:center;" |1 [[kilogram]] (1kg)
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x10<sup>6</sup>.
-| style="height:20px; width:200px; text-align:center;" |1x10<sup>6</sup>mg
-|-
-| style="height:20px; width:200px; text-align:center;" |1 gram (1g)
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x10<sup>3</sup>.
-| style="height:20px; width:200px; text-align:center;" |1x10<sup>3</sup>mg
-|-
-| style="height:20px; width:200px; text-align:center;" |1 milligram 1(mg)
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x1.
-| style="height:20px; width:200px; text-align:center;" |1mg
-|-
-| style="height:20px; width:200px; text-align:center;" |1 microgram 1(µg)
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x10<sup>-3</sup>.
-| style="height:20px; width:200px; text-align:center;" |1x10<sup>-3</sup>mg
-|-
-| style="height:20px; width:200px; text-align:center;" |1 nanogram 1(ng)
-| style="height:20px; width:200px; text-align:center;" |Convert to '''milligrams''' x10<sup>-6</sup>.
-| style="height:20px; width:200px; text-align:center;" |1x10<sup>-6</sup>mg
-|}