All Answers (8) 1  This is nice information from wikipedia visit. 2  I guess if you assume the DNA is at rest with an average rise of 3.4 A per base pair, then the length of chr1 would be 3.4A * 249*10^6, i.e. 847*10^6A, i.e. ~85 mm, or 8.5 cm.
Boiler sizing includes two things: 1  The heating and hot water capabilities of the boiler. 2  The physical size of your boiler and whether it will fit in the space you have it destined for.
Pros of combi boilers. 1  a gas combi boiler system contains almost all components within the boiler itself, which makes the boiler system more compact and neater looking. 2  there's no need for a cold water or feed and expansion tank in the loft, and you can immediately get hot water heated on demand.his type of system will also usually require cold water, as well as feed and expansion tanks in the loft. With a heat-only boiler (also known as a conventional boiler system), the hot water is stored in a hot water cylinder or hot water storage tank.