This boiling point calculator tells you how to calculate the boiling point of most common substances at an arbitrary pressure, basing on the Clausius–Clapeyron relation. Whether you want to analyze water, ethanol or ammonia, simply provide some reference values and this calculator will do the work for you. Read on to learn what exactly is the boiling point definition and what equation can you use to determine its value.
Boiling point is simply the temperature at which water starts boiling - in other words, it changes its state from liquid to gas. This temperature is dependent on pressure and the substance latent heat of vaporization. The latter property is unique for each substance - you can be sure that two samples of water will have the same latent heat.
Our boiling point calculator uses the Clausius–Clapeyron relation to establish the boiling point of any substance at a given pressure. This equation characterizes phase transitions (such as vaporization) and relates the pressure to boiling point in a following way:
ln(P₁/P₂) = -L/R * (1/T₁ - 1/T₂)
This calculator has the values of P₁ and T₁ set to 1013.25 hPa and 100°C respectively. These values correspond to the normal atmospheric pressure at the sea level and boiling point of water. You need to set different values if you are calculating the boiling point at altitude or are analyzing a different substance.