One Question per Day (January 14, 2018)
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In coal quality analysis, what are the four commonly used \"bases\"? Air-dry basis, dry basis, received basis, dry ash-free basis
Answer: Air-dry basis, dry basis, received basis, dry ash-free basis
Air-dry basis volatile matter (symbol: Vad), dry basis volatile matter (symbol: Vd), received basis volatile matter (symbol: Var), and dried ash-free basis volatile matter (symbol: Vdaf).
Air-dry basis, dry basis, dry ash-free basis, received basis
Air-dry basis, dry basis, received basis, dry ash-free basis, dry mineral-free basis
Answer: Air-dry basis； Received base ； Dried ash-free base ； Dry, mineral-free base.
Air-dry basis, dry basis, received basis, dry ash-free basis
⑴Air-dry basis ⑵ Dry basis ⑶ Dry ash-free basis ⑷ Received basis
“Base on received value”, “air-dried base”, “dry base”, “dry, ash-free”
Answer: The commonly used bases are: 1. Air-dried base. The air-dry basis is based on coal in equilibrium with air humidity, and its symbol is ad. 2. Dry basis. The dry basis is based on the hypothetical anhydrous state of coal, and its symbol is d. In national standards, the allowable errors for different laboratories are expressed on a dry basis. 3. Dry, ash-free base. The dry ash-free basis is based on an imaginary anhydrous and ash-free state of coal, and its symbol is DAF. The dry ash-free basis is commonly used for volatiles. 4. Received base. The received base is based on the coal in the user’s received state, and its symbol is ar.
Air-dry basis; dry basis; received basis; dry ash-free basis.