Measurements of temperature were once made in physics laboratories with an apparatus known as a weight thermometer. This thermometer consisted of a hollow platinum sphere filled with mercury in which there was a capillary orifice. The temperature is determined by the quantity of mercury coming out of the orifice. How much mercury will come out of the orifice of such a thermometer for a temperature rise of 1°C if at 0°C the completely filled sphere of the thermometer held 700 g of mercury? The coefficient of cubical expansion of platinum is 2.7 x 10-5/°C and that of mercury 1.8 x 10-4/°C.
