PPM

In the year 2020, the concentration of CH₄ (methane) in the atmosphere is...

• 413 ppm

• 1889 ppb

• 333 ppb

• 500 ppb

Tags

NGSS.HS-ESS2-4

NGSS.HS-ESS2-6

NGSS.HS-ESS3-5

In the year 1750, what was the concentration of N₂O (nitrous oxide) in the atmosphere?

• 277 ppm

• 413 ppb

• 694 ppb

• 271 ppb

In 1950, what was the concentration of CO2 in the atmosphere?

• 277 ppm

• 282 ppb

• 290 ppb

• 311 ppb

Tags

NGSS.MS-ESS3-4

NGSS.MS-ESS3-5

What does PPM stand for in scientific measurements?

• Parts Per Million

• Particles Per Molecule

• Pressure Per Meter

• Potential Per Molecule

In environmental science, PPM is often used to measure the concentration of pollutants. If a water sample has a lead concentration of 15 PPM, what does this mean?

• 15 parts of lead per million parts of water

• 15 parts of water per million parts of lead

• 15 parts of lead per billion parts of water

• 15 parts of water per billion parts of lead

Which of the following is a correct representation of 1 PPM in terms of percentage?

• 0.0001%

• 0.001%

• 0.01%

• 0.1%

If a solution has a concentration of 500 PPM, how many grams of solute are present in 1 liter of solution?

• 0.5 grams

• 5 grams

• 50 grams

• 500 grams

PPM is often used in chemistry to express the concentration of a solute in a solution. Which of the following is equivalent to 1 PPM?

• 1 milligram per liter

• 1 gram per liter

• 1 microgram per liter

• 1 kilogram per liter

In air quality measurements, a carbon monoxide level of 9 PPM is considered safe. What does this imply about the air composition?

• 9 parts of carbon monoxide per million parts of air

• 9 parts of air per million parts of carbon monoxide

• 9 parts of carbon monoxide per billion parts of air

• 9 parts of air per billion parts of carbon monoxide

How is PPM used in the context of soil science?

• To measure the concentration of nutrients

• To measure the soil pH

• To measure the soil temperature

• To measure the soil moisture content