Regulators on Dec. 24, 2013, approved a price hike of 3 cents for a first-class stamp, bringing the charge to 49 cents a letter in an effort to help the Postal Service recover from severe mail decreases brought on after the 2008 economic downturn.
C-value â Thermal Conductance. Thermal conductance is the time rate of steady state heat flow through a unit area of a material or construction induced by a unit temperature difference between the body surfaces, in W/m2âK. C-value, hence, is the reciprocal of the R-value and can be expressed as Equation (3).
Thermal resistance. Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. Thermal resistance is the reciprocal of thermal conductance. (Absolute) thermal resistance R in K/W is a property of a particular component. For example, a characteristic of a heat sink.