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This formula gives an aproximate ratio of cold water (from a refrigerator) to hot water (boiled in a kettel), for the porpose of yeilding body tempature water for proofing active dry yeast
\begin{equation} \frac{m_c}{m_h} = \frac{T_f - T_h}{T_c - T_f} \end{equation}
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$m_c$ is mass of cold water -
$m_h$ is mass of hot water -
$T_f$ is desired temperature -
$T_c$ is temperature of cold water -
$T_h$ is temperature of hot water.
In order to make body temperature water (98.7°F / 37°C) to proof active dry yeast with, mix 3 parts of cold water from refrigerator (64°F / 17.8°C) and 10 parts of boiling water (212°F / 100°C).
To make 13 oz of body temperature water, mix 3 oz cold water with 10 oz boiling water.