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Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride , carbon dioxide , and water:
Roll-off of a first-order low-pass filter at 6 dB/octave (20 dB/decade) A simple first-order network such as a RC circuit will have a roll-off of 20 dB/decade. This is approximately equal (to within normal engineering required accuracy) to 6 dB/octave and is the more usual description given for this roll-off.
Sales dropped considerably, to just under 2.2 million specimens in uncirculated and 1.8 million in proof. [50] The part-silver 1972-S Eisenhower dollars were available for sale by mail order, with the ordering period from May 1 to July 15 for the proof coins and August 1 to October 16 for the uncirculated version. [31]
The hypothesis of dark matter has an elaborate history. [18] [19] In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, [18] Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that the Sun ...
Machu Picchu [a] is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a mountain ridge at 2,430 meters (7,970 ft). [8] Often referred to as the "Lost City of the Incas", [9] it is the most familiar icon of the Inca Empire.
Following the election of Donald Trump in November 2016, Harris was named as part of the "Hell-No Caucus" by Politico in 2018, along with Senators Cory Booker, Kirsten Gillibrand, Elizabeth Warren, and Bernie Sanders, given she voted "overwhelmingly to thwart [Trump's] nominees for administration jobs", such as with Rex Tillerson, Betsy DeVos, and Mike Pompeo; all the senators in this group ...
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