Module 4 - Measurements & Units

Question 1

What are measurements

Answer 1

A process of systematically assigning numbers to the properties of an object with the aim of studying and describing objects, phenomenon and their relationships.

Question 2

Basic Quantity Must be defined

Answer 2

in terms of a standard (meter, kilogram, second).

Question 3

Derived Quantity Defined in terms of

Answer 3

combinations of basic quantities

Question 4

ºC to Fº

Answer 4

ºF= 32 + 9/5 ºC

Question 5

Celsius to Kelvin

Answer 5

ºK = ºC +273

Question 6

Define Density

Answer 6

Mass per unit volume

Question 7

Density formula

Answer 7

d= m/v
Density = mass/ volume

Question 8

Density units

Answer 8

g/mL
g/cm³

Question 9

Specific gravity

Answer 9

SG = d substance/ d water

Question 10

When to count zero as SF

Answer 10

When they are between digits eg 28009

When they come after a decimal point and significant figure eg 2.800

Question 11

When to not count zeros as significant figures

Answer 11

When the are at the beginning of a number eg. 003

When the are not after a decimal point eg 2800

When they are after a decimal point but no significant figure eg. 23.0088

Question 12

Define Accuracy

Answer 12

The closeness