Units of Length

Millimeter

• very small unit of length
• represented by a lower case mm
• measure the thickness of a coin or a cardboard, etc

  cardboard

 coin

                                         

Centimeter

• small unit of length
• represented by a lower case cm
• measure the length of a laptop or a book, etc

 

    book

 laptop

                    

Meter

• the basic unit of length
• represented by a lower case m
• measure the length of a guitar or the height of a kid, etc

guitar

                    
                                                               

   

                           

Kilometer

• large unit of length
• represented by a lower case km
• measure the distance of highway or the length of river, etc

                                                 

river

highway