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2. Abbe number - Wikipedia

   en.wikipedia.org/wiki/Abbe_number

   Most of the human eye's wavelength sensitivity curve, shown here, is bracketed by the Abbe number reference wavelengths of 486.1 nm (blue) and 656.3 nm (red) Abbe numbers are used in the design of achromatic lenses , as their reciprocal is proportional to dispersion (slope of refractive index versus wavelength) in the wavelength region where ...

3. Plate glass - Wikipedia

   en.wikipedia.org/wiki/Plate_glass

   Plate glass is often used in windows. Fragment of a Roman window glass plate dated to 1st to 4th century CE. Plate glass, flat glass or sheet glass is a type of glass, initially produced in plane form, commonly used for windows, glass doors, transparent walls, and windscreens.

4. Poly(methyl methacrylate) - Wikipedia

   en.wikipedia.org/wiki/Poly(methyl_methacrylate)

   It has a density of 1.17–1.20 g/cm 3, [1] [16] which is approximately half that of glass, which is generally, depending on composition, 2.2–2.53 g/cm 3. [1] It also has good impact strength, higher than both glass and polystyrene, but significantly lower than polycarbonate and some engineered polymers.

5. 3 Best Christmas Items at Lowe’s That Can Be Reused ... - AOL

   www.aol.com/finance/3-best-christmas-items-lowe...

   These standout items from Lowe’s collection of well-designed, high-quality decorations are worth considering.” Check Out: 8 Christmas Items To Get at Five Below That Cost Way More at Walmart

6. List of physical properties of glass - Wikipedia

   en.wikipedia.org/wiki/List_of_physical...

   at 20 °C, GPa 72 65 75 67 72 43.3 [9] Shear modulus at 20 °C, GPa 29.8 28.2 26.8 31.3 Liquidus temperature, °C 1040 1070 [10] 1715 1115 Heat capacity at 20 °C, J/(mol·K) 49 50 50 51 44 52 Surface tension, at ~1300 °C, mJ/m 2: 315 370 290 Chemical durability, Hydrolytic class, after ISO 719 [11] 3 1 3

7. Mesh (scale) - Wikipedia

   en.wikipedia.org/wiki/Mesh_(scale)

   Although such information contains long lists of sieve sizes, in practice sieves are normally used in series in which each member sieve is selected to pass particles approximately 1/ √ 2 smaller in diameter or 1/2 smaller in cross-sectional area than the previous sieve. For example the series 80mm, 63, 40, 31.5, 20, 16, 14, 10, 8, 6.3, 4, 2.8 ...