Enter the observed gravity, temperature, and calibration temperature into the calculator to determine the corrected gravity. This calculator helps adjust the gravity reading of a liquid based on temperature differences from the calibration standard.
Gravity Correction Formula
The following formula is used to calculate the corrected gravity:
CG = OG + [CF * (T - CT) / (1 + 0.004 * OG)]
Variables:
- CG is the corrected gravity (°Plato)
- OG is the observed gravity (°Plato)
- CF is the correction factor (1.313452 for Plato scale)
- T is the temperature at which the gravity is observed (°C)
- CT is the calibration temperature (°C)
To calculate the corrected gravity, add the product of the correction factor and the difference between the observed temperature and the calibration temperature, divided by the sum of 1 and the product of 0.004 and the observed gravity, to the observed gravity.
What is Gravity Correction?
Gravity correction is the process of adjusting the gravity reading of a liquid to account for temperature differences from the calibration standard. This is important in industries such as brewing, where the sugar content of a liquid is measured using a hydrometer or refractometer at a specific calibration temperature, typically 20°C. Since the density of a liquid changes with temperature, the observed gravity must be corrected to ensure accurate readings.
How to Calculate Corrected Gravity?
The following steps outline how to calculate the Corrected Gravity.
- First, determine the observed gravity (OG) in degrees Plato.
- Next, determine the temperature (T) at which the gravity is observed in degrees Celsius.
- Next, determine the calibration temperature (CT) in degrees Celsius.
- Use the correction factor (CF) of 1.313452 for the Plato scale.
- Finally, calculate the Corrected Gravity (CG) in degrees Plato.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
observed gravity (OG) = 12.5 °Plato
temperature (T) = 25 °C
calibration temperature (CT) = 20 °C
