Why can't the water as the heat of the thermometer element?

Working principle of the thermometer is different according to different purpose, has been designed and manufactured by a multitude of thermometer. The basis of its design are: the use of solid, liquid and gas is influenced by temperature and heat bilges cold shrink phenomenon, such as glass rod thermometer; Under the condition of constant volume, gas ( Due to different temperature or steam pressure changes, such as pressure thermometer; The role of thermoelectric effect; Resistance varies with temperature, such as resistance thermometer. The influence of thermal radiation, etc. Generally speaking, any physical properties of all matter, as long as it along with the change of temperature and drab, significant changes in, and made available to signal temperature thermometer. According to its working principle is different, all kinds of the temperature sensing element of the thermometer, temperature sensing element is different also, but in all heat element and element does not contain water. All cannot serve as the temperature of the thermometer elements of water because water does not conform to the working principle of the thermometer, the water is 0 4 c heat bilges cold, density of 4 degrees Celsius maximum, minimum volume. Boiling point and freezing point of water is 0 degrees to 100 degrees Celsius, despite the heat bilges cold do not say, but this is alright, measuring range is too small.