Understanding Parts Per Million and Percent

The video tutorial explains various units of measurement such as per mil, parts per million, billion, and trillion. It covers how these units are used in atmospheric chemistry, particularly in measuring carbon dioxide levels. The tutorial also demonstrates how to convert between these units and provides practical examples, emphasizing the importance of using appropriate units for different compounds.

What does 'per mil' represent in terms of powers of ten?

• 1 times 10 to the power of 9

• 1 times 10 to the power of 6

• 1 times 10 to the power of 3

• 1 times 10 to the power of 2

If oxygen is 20% of the Earth's atmosphere, how many per mil is it?

• 200 per mil

• 400 per mil

• 100 per mil

• 500 per mil

How do you convert from percent to parts per million?

• Multiply by 10 to the power of 2

• Multiply by 10 to the power of 3

• Multiply by 10 to the power of 4

• Multiply by 10 to the power of 6

What is the difference in powers of ten when converting from parts per million to parts per billion?

• 4

• 3

• 9

• 6

In atmospheric chemistry, which unit is commonly used for carbon dioxide?

• Percent

• Parts per million

• Parts per billion

• Per mil

What is the conversion factor when going from parts per billion to parts per trillion?

• 10 to the power of 6

• 10 to the power of 4

• 10 to the power of 2

• 10 to the power of 3

How is 400 parts per million of carbon dioxide expressed as a percent?

• 0.4%

• 4%

• 0.04%

• 0.004%

What is the significance of using appropriate units in atmospheric chemistry?

• It ensures accurate communication of data.

• It simplifies the study of chemistry.

• It makes calculations easier.

• It reduces the need for conversions.

What is the power of ten difference when converting from parts per million to percent?

• 4

• 3

• 6

• 2

Why is it important to decrease the number by 4 decimal places when converting parts per million to percent?

• To simplify the number

• To accurately represent the smaller unit

• To match the unit size

• To increase precision