In simpler terms, the potential hole does not release particles of certain energies, and an «empty space» appears in the spectrum. (sciencedaily.com)
Buyers who qualify can add up to $ 6,000 to their loan amount to make certain energy efficiency improvements. (hawaii.veteransunited.com)
Although physical delivery is an important mechanism for certain energy, metals and agriculture products, only a small percent of all commodities futures contracts are physically delivered. (us.etrade.com)