The tools that should be used to record the most complete data about a gas are a manometer and a thermometer. Manometer is a device that measures pressure; therefore using this device the pressure of a gas may be determined. A manometer consists of a U shaped tube of glass filled with some liquid; normally mercury. Thermometer on the other hand measures the temperature of the gas. It measures temperatures in degrees, according to either the Celsius or Fahrenheit.
Well, to separate salt from water, you would stir the two together to create a homogenous mixture. Then you would boil the mixture; all the water would evaporate, leaving behind the salt
