One of the most important standards that the API has set is the method used for measuring the density of petroleum. This standard is called the API gravity. Specific gravity is a ratio of the density of one substance to the density of a reference substance, usually water.
The most common symptoms of RSI include: 1  Pain. 2  Tingling. 3  A feeling of restlessness in the joint. 4  Weakness. 5  Throbbing. 6  Stiffness or cramp.
Signs and Symptoms of MCI. In order to be diagnosed with MCI, you would need to display at least one of these key symptoms: Issues with your memory. Another form of neurological dysfunction â issues with language, poor sensory perception, a lack of executive functioning, or reduced motor activity.