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.
An object with a density of 85 kg/m 3 has a specific gravity of 0.085, and will float high on the surface of a body of water. An object with a density of 85 g/cm 3 has a specific gravity of 85, and will sink rapidly. To find the specific gravity of a gas, you must know its density in kilograms per meter cubed (kg/m 3). Then, divide this density by the density of dry air at standard temperature and pressure.