Learn English Grammar From A–Z
- Combustion, or burning, is a chemical process involving carbon, hydrogen and oxygen.
- It is composed mostly of isotopes of hydrogen and helium and includes 60 other elements including neon, argon carbon, nitrogen, oxygen and iron.
- Consider the top five constituents of the cosmos, in order of their abundance: hydrogen, helium, oxygen, carbon, and nitrogen.
- Proteins are composed of carbon, hydrogen, oxygen, and nitrogen; it is the presence of the last of these which distinguishes proteins from the other materials of life.
- After running his models, Saumon concluded that in Saturn, heavy elements like iron, silicon, carbon, nitrogen and oxygen are concentrated in the core of the planet.
- The plan is that these will determine the abundance and stable isotopic compositions of elements such as hydrogen, carbon, nitrogen and oxygen.
- The biosphere consists of six main elements: carbon, nitrogen, phosphorus, sulphur, oxygen, and hydrogen.
- The search for life focuses mostly on planets with liquid water, a heat or energy source, and chemicals like carbon, hydrogen, and oxygen.
- The ozone depleting compounds contain combinations of the elements chlorine, fluorine, bromine, carbon and hydrogen.
- For common cast iron, the main elements of the chemical composition are carbon and silicon.
- Silicon reacts chemically like carbon although it does not form multiple bonds.
- The light elements such as hydrogen, carbon, nitrogen, and oxygen are especially plentiful in space.
- Most plants live with their heads above ground, where they pick up carbon, hydrogen and oxygen floating in the air.
- The action of the micro-organisms will reduce the nitrogen, carbon and phosphate levels of the dam.
- Every source of soot, every fuel and means of burning it, has its own ratio of soot to organic carbon; few have yet been analyzed.
- We know that the Moon is low on certain chemicals such as hydrogen and carbon.
- One possibility of this sort of manipulation could turn carbon into either graphite or diamond.
- Then again, a diamond is only carbon (with a skin of hydrogen, one molecule thick): why shouldn't it be almost as combustible as coal?
- The amount of carbon in the coal will combine in combustion with oxygen, and it has to go somewhere.
- On the Earth, it is found only in combination with other elements, such as oxygen, carbon, and nitrogen.
- The carbons last approximately 2 hours and then are replaced.
- By the 1970's there was no longer a source for the 2 1/2 inch carbons that were required for this light.
- This was in the good old days when you drew your layouts on a massive piece of grid paper outfitted with a carbon layer so there were three copies.
- All copies either had to be produced with carbons or on ‘skins’ fed through the temperamental duplicator.
- If there is a carbon, also ask for that from the clerk and shred it when you go home.
- Also, because the operator making the observation actually does the input, errors caused when someone misinterprets values on poor-quality carbons or misunderstands fine shades of meaning are eliminated.
- The first samizdat were typed carbons, definitely not books, just as the Samizdat you are holding now is definitely not the usual literary journal.
- Luckily, her maid had written receipts and kept the carbons.
- Someone could go through your trash to find discarded receipts or carbons and use them to learn your account numbers.
- They glide their tracing wheels (used in sewing) over the top of the carbons.
- Customers were told to keep their carbons so the account number could not be reused.