Heartburn is often triggered by foods. This is because certain substances irritate the esophagus or weaken the lower esophageal sphincter (LES), which prevents the backward flow of stomach contents that causes reflux. Triggers can include: 1  alcohol. 2  caffeinated products, such as coffee, soda, and tea. 3  chocolate. 4  citrus fruits. 5  garlic. 6  fatty foods. 7  onions.
Testing specific gravity of fuel. Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
Urine specific gravity is a more precise measurement of your urineâs overall concentration than the color of your urine alone. Your doctor will look at the ratio of the density of your urine to the density of water. To put it another way, the specific density of water itself would be 1.000.Ideally, urine specific gravity results will fall between 1.002 and 1.030 if your kidneys are functioning at a normal level. valid sample for urine specific gravity testing contains at least 1 to 2 ounces of urine. The best time to obtain the sample is first thing in the morning, when your urine is the most concentrated.