A British Thermal Unit (Btu) is a measure of energy content, usually used to describe the energy content of fuels. Because a Btu is so small, energy is usually measured in millions of Btus. 1 Btu = the amount of energy required to increase the temperature of one pound of water (which is equivalent to one pint) by one degree Fahrenheit. This is roughly the heat produced from burning one match. 1,000 Btu = four-fifths of the energy contained in a peanut butter and jelly sandwich.
Silver Lake is a naturally formed lake of 634 acres that is over 3 km in length with a maximum depth of about 20 m. The Jones River runs for 12 km from Silver Lake to Kingston Bay with a drainage area of 77 km 2. The Jones River is the largest freshwater drainage to Cape Cod Bay. Silver Lake is included in or borders the towns of Pembroke, Kingston, Plympton, and Halifax.
Piscataqua River. The Piscataqua River (/pÉªsËkÃ¦tÉËkwÉË, -kwÉ/) is a 12-mile-long (19 km) tidal river forming the boundary of the U.S. states of New Hampshire and Maine from its origin at the confluence of the Salmon Falls River and Cocheco River.