I can't seem to figure out this question. A Thermometer is filled with unknown liquid. It has a square bulb and a stem with cylinder shape. It is found that the volume of the liquid increased by 40% when the temperature changes by 15 Celsius. Calculate the coefficient of expansion of volume of the liquid and the radius of the stem if the liquid rises by 5 cm? Do I need to use the formula: ΔV = VβΔT Don't know how to tackle this question any help would be appreciated.