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.
Cease the sport or activity that led to the RSI in order to take a break and reduce the repetitive strain. Icing the affected area can help with pain and reducing any accompanying swelling, as can anti-inflammatory medications like ibuprofen (always check with a doctor before starting a new program of medication).t will often worsen after activity, especially those in which posture or repetitive movements are key. RSI can also present without pain symptoms, and other warning signs in the affected body parts include fatigue, numbness, an inability to sufficiently control their motion, and coldness.