Determining Boiling Point from Temperature

• 1). Pour your liquid into a pot.
  
  
• 2). Place the pot on a stove top burner.
  
  
• 3). Turn on the burner on which your pot and liquid are sitting.
  
  
• 4). Place a thermometer in the liquid in the pot.
  
  
• 5). Watch the liquid and wait for it to boil. Note the temperature reading on the thermometer at the exact moment that the liquid begins to boil. This is the moment that the liquid begins to bubble. The the temperature at that moment will tell you the boiling point of the liquid.
  
  

Determining the Boiling Point from Pressure

• 1). Determine the pressure in your location with a barometer. Convert the pressure to millimeters if needed. Convert inches to millimeters by multiplying the inches by 25.4.
  
  1 inch = 25.4 millimeters
  
  
• 2). Subtract the pressure reading from the barometer (mm Hg) from sea level pressure, which is 760 mm Hg.
  
  
• 3). Divide the answer from the previous step by 28 mm Hg, which is the equivalent to a change in temperature of 1 degree Celsius.
  
  
• 4). Find the boiling point by adding 100 degrees Celsius to the answer from the previous step if the pressure in your location is higher than sea level pressure. Subtract 100 degrees Celsius if the pressure in your location is lower than sea level pressure.