- °Brix is an arbitrary scale used in the sugar industry to measure the concentration of sucrose in an aqueous solution.
- °Baume is used for measuring the density of liquids.
- °API is used in the oil industry to measure the density of petroleum liquids.
- °Twaddle is a scale used for measuring the density of liquids, primarily in the chemical industry.
Conclusion:
The correct answer is °Brix, which is used in the sugar industry to measure the concentration of sugar.

If A + B means A is the mother of B; A - B means A is the brother of B; A % B means A is the father of B, and A \(\times\) B means A is the sister of B, which of the following shows that P is the maternal uncle of Q?