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Killo Watts (kw)
1000 watts = 1 killo watt---1000 killowatts= 1 Mega watt ---1000 Megawatts= 1 Giga watt 1000 Gigawatts= 1 Tetra watt ---1000 Tetrawatst= 1 Peta watt ---1000 Petawatts= 1 Exa watt --- 1 mega watt is equal to 1000000 =1 lac.
Rolls and batts -- or blankets -- are flexible products made from mineral fibers, such as fiberglass and rock wool. They are available in widths suited to standard spacing of wall studs and attic or floor joists: 2 inch x 4 inch walls can hold R-13 or R-15 batts; 2 inch x 6 inch walls can use R-19 or R-21 products.
Rigid foam insulation is typically more expensive than rolls and batts or loose-fill insulation, but it is very effective in exterior wall sheathing, interior sheathing for basement walls, and special applications such as attic hatches. Foam insulation R-values range from R-4 to R-6.5 per inch of thickness, which is up to 2 times greater than most other insulating materials of the same thickness.
Energy Switch MA
Gov Office of Energy Efficiency & Renewable Energy