When you set a pot of tap water on the stove to boil, you'll often see bubbles start to form well before boiling temperature is ever reached. explain this observation.
1. these initial bubbles are the gases that were dissolved in the water coming out of solution. the solubility of gases in water decreases with increasing temperature.
2. they are very minute pockets of water in the gaseous phase. when they get large enough, the water will boil as this gas escapes.
3. these bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated.
4. these are dissolved salts heating up and escaping from the water.

Explain vector addition, triangle method and parallelogram method

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

What is the major limitation to the light microscope?