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Ppm stands for parts per million. It is a way of showing the amount of one substance in another, like carbon dioxide in the atmosphere, especially when the percentage number is small.
For example, in July 2011, the amount of carbon dioxide in the earth's atmosphere was 392.39 ppm (or 0.039239%).
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By how much have carbon dioxide emissions increased its atmospheric percentage over the past 250 years?
CO2 levels were about 260-280 ppm immediately before industrial emissions began and did not vary much from this level during the preceding 10,000 years. The concentration of carbon dioxide (CO2) in Earth's atmosphere has reached 391 ppm (parts per million) as of October 2012. ((391-260)/391)*100 = 33.50 Thus there has been a 33.5% increase in the levels of CO2 in Earth's atmosphere over the past 250 years.
It is believed that excessive CO2 emissions will cause?
CO2 is carbon dioxide, and excessive CO2 is believed to cause Global Warming.
Is there a strong connection between CO2 emissions and global climate change?
There is a strong connection between CO2 emissions and global climate change. Read the NASA website link below.
What is above normal levels of carbon dioxide?
Above 400 ppm of co2 would be considered high.
Why do you expect seasonal variation in the atmospheric CO2 levels?
Global carbon dioxide levels are highest in May and lowest in October. The Northern Hemisphere has much more land for vegetation to grow on compared to the Southern Hemisphere. Carbon dioxide (CO2) builds up slowly during the northern winter, when trees and plants are dormant. Then in May everything begins to grow, and CO2 is taken out of the atmosphere, so the levels start coming down. In October and November vegetation stops growing, and in its dormant state it stops absorbing CO2, so the carbon in the atmosphere increases. These levels go up and down like this every year. The readings for 1958, 1959 and 1960 show this: 1960: May: 320.5 ppm: October: 314.5 ppm 1959: May: 320.0 ppm: October: 313.5 ppm 1958: May: 318.0 ppm: October: 313.0 ppm Ppm means parts per million, so 320 ppm is the same as 0.032 percent (per hundred). The recent readings for May are: 2011: 394.35 ppm 2010: 393.22 ppm 2009: 390.18 ppm See the graph at the link below.
How much have the world's CO2 level risen in a decade?
In 2003 carbon dioxide emissions were 370 ppm (parts per million). This year (2013) they reached 400 ppm. At the beginning of the Industrial Revolution they had been 280 ppm for thousands of years.
How ppm is used in cars?
In measuring exhaust emissions.
By how much have carbon dioxide emissions increased its atmospheric percentage over the past 250 years?
CO2 levels were about 260-280 ppm immediately before industrial emissions began and did not vary much from this level during the preceding 10,000 years. The concentration of carbon dioxide (CO2) in Earth's atmosphere has reached 391 ppm (parts per million) as of October 2012. ((391-260)/391)*100 = 33.50 Thus there has been a 33.5% increase in the levels of CO2 in Earth's atmosphere over the past 250 years.
How much ppm are there in co2 fire extinguisher?
It should be at least 99.5 percent CO2.
What does ppm mean relating to an emissions test?
Parts Per Million.
CO2 probe sensor?
A CO2 probe sensor measures gaseous carbon dioxide. It comes in two ranges, 0 to 10,000 ppm and 0 to 100,000 ppm.
What is smoke density?
measures how many (usually) parts per million (ppm) of whatever smoke/gas/etc is being looked for. For instance a smoke detector looks for X ppm of smoke in air, or a CO2 sensor measures the ppm of CO2 in air - ppm is a measure of density.
What is smoke density analyser?
measures how many (usually) parts per million (ppm) of whatever smoke/gas/etc is being looked for. For instance a smoke detector looks for X ppm of smoke in air, or a CO2 sensor measures the ppm of CO2 in air - ppm is a measure of density.
What happened to the carbon dioxide level in 1950?
In 2000 carbon dioxide emissions were 368 ppm (parts per million). This year (2013) they reached 400 ppm. At the beginning of the Industrial Revolution they had been 280 ppm for thousands of years.
How much have the atmospheric carbon dioxide concentrations increased in recent years?
Over the last 150 years, CO2 concentrations have increased from around 300 ppm to around 400 ppm - mostly in the last 70 years or so. Current scientific thinking is that anything over 350 ppm is likely to have unwanted consequences.
Why is it dangerous to keep increasing the amount of CO2 in atmosphere?
We won't asphyxiate. But CO2 is a heat trapping gas, and it takes decades for the earth to adjust to any slight rise. Human activity has increased CO2 levels from 280 ppm prior to the industrial revolution to nearly 400 ppm today. We will pass 500 ppm before 2050, at the current rate. Many climate scientists believe 350 ppm may be the maximum sustainable level for CO2.
What is HC (ppm) on emissions test?
High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. Hydrocarbons are basically raw fuel. PPM (parts-per-million) is a way of quantifying small concentrations.
