How to convert between nm, um, mm, m and km

• What are the different units of length mentioned in the video?

  Nanometers, micrometers, millimeters, meters, and kilometers
• Why do we use different units of length?


  Each unit is 1,000 times bigger or smaller than the one next to it
• How do you convert 6 mm to meters?


  Divide 6 by 1,000 to get 0.006 m
• What is the result of converting 6 mm to kilometers?


  0.006 km or $6 \times 10^{-6} \text{ km}$
• How do you convert 6 mm to micrometers?


  Multiply 6 by 1,000 to get 6,000 micrometers
• What is the conversion of 6 mm to nanometers?


  Multiply 6 by 1,000 twice to get 6,000,000 nanometers
• How do you convert units that aren't next to each other on the scale?


  Convert in steps through the nearest units
• How would you convert 340 nanometers to millimeters?


  First convert to micrometers, then to millimeters
• What is the size range of small atoms?

  0.1 to 0.5 nanometers across
• How big are medium-sized molecules like glucose?


  About 1 nanometer across
• What is the approximate size of viruses?


  About 100 nanometers across
• What is the size of small cells like bacteria?

  About 1 micrometer
• What is the size range of most animal and plant cells?

  10 to 100 micrometers
• How wide is human hair?

  About 100 micrometers
• What is the smallest size visible to the naked human eye?

  About 100 micrometers
• What can you see with a light microscope?


  Down to about 500 nanometers
• What is the resolution of an electron microscope?


  About 0.1 nanometers
• How many millimeters are in a centimeter?


  10 millimeters
• How many centimeters are in a meter?


  100 centimeters
• How do you convert centimeters to meters?


  Divide the number by 100
• How do you convert centimeters to millimeters?


  Multiply the number by 10
• How would you convert 30 cm to nanometers?


  Multiply by 10 to get mm, then by 1,000 to get micrometers, and then by 1,000 again to get nanometers
• What is the final result of converting 30 cm to nanometers?


  300 million nanometers or $3 \times 10^{8} \text{ nanometers}$
• What is the general rule for converting between units of length?


  • To convert to a larger unit, divide by 1,000 for each place moved up.
  • To convert to a smaller unit, multiply by 1,000 for each place moved down.
• What are the sizes of common objects in relation to the units of length discussed?

  • Atoms: 0.1 to 0.5 nanometers
  • Molecules (e.g., glucose): ~1 nanometer
  • Viruses: ~100 nanometers
  • Bacteria: ~1 micrometer
  • Animal and plant cells: 10 to 100 micrometers
  • Human hair: ~100 micrometers
• What are the steps to convert centimeters to nanometers?


  1. Convert centimeters to millimeters by multiplying by 10.
  2. Convert millimeters to micrometers by multiplying by 1,000.
  3. Convert micrometers to nanometers by multiplying by 1,000.