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.
The River Thames is a river that flows through southern England, most notably through London. At 215 miles, it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn. It also flows through Oxford, Reading, Henley-on-Thames and Windsor. The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock. It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary.