5.6
To accurately calculate the U-value for windows, you need to consider factors such as the type of glass, frame material, and any additional insulation. The U-value represents the rate of heat transfer through the window, so a lower U-value indicates better insulation. You can use online calculators or consult with a professional to determine the U-value of your windows accurately.
glass cutter is when u cut glass using a glass cutter
see http://www.k-mac-plastics.net/data%20sheets/ATG-014S1.pdf i believe it is 1/3 for .325 inch thick
Glass has an R value of approximately 0.14 per inch thickness Celluloid (Lexan, Plexiglass?) has an R value of approximately 0.7 per inch thickness [source: http://www.bobvila.com/wwwboard/messages/37235.html] U value is the inverse of the R value. (U-value = 1/R-value) Using this equation and the values above, the the U value of plexiglass is approximately 1.4 per inch of thickness. The U-value of glass is 7.0 per inch of thickness. So, if these values are correct, then Plexiglas is approximately five times as resistant to heat transfer by conduction as glass. I have seen this conclusion elsewhere a long time ago, but I have also seen values for plexiglass on a plastics dealer's web site that said the R-values of glass and plexiglass were approximately equal. On another site, a value of 1.35 Btu*in/hr*ft^2*ºF [source: http://www.plasticsintl.com/sortable_materials.php?display=thermal&sort=thermal_conductivity] There are some values given in SI units on other sites, generally consistent with the values given above. Thermal conductivity of Acrylic sheet is listed as 0.2 (W·m−1·K−1) while glass is listed as having a range of values from 0.8 to 1.4, depending on the composition (0.8d−0.93e((96%SiO2)1.2-1.4g W-m−1·K−1) [http://en.wikipedia.org/wiki/List_of_thermal_conductivities] Again, then, the U value or thermal conductivity of plexiglass is given as between 1/4 and 1/7 that of glass. More authoritative information and further discussion of this question would be greatly appreciated.
it depends if u recycle the glass after
There is not a definitive value for antique red glass. There are not only differing prices for when the glass was created, but what shade of red they are, such as ruby or cranberry.
The U value is the inverse of the R value. For R value 19 insulation the U value is 1/19, or 0.0526.
Glass is around a 5.5 on the Mohs scale of hardness. This means that materials with a higher value on the scale can scratch glass, while those with a lower value cannot.
what is the value of a hobnail pedastal vase
the value used for a substance's properties accepted by everyone
1.33 The IOR of 1.33 is the common value for water at 0°C, and to me is not the common accepted value for glass. That being said, there are many different types of glass, and they all vary in IOR. However a common standard value for glass is 1.5
To convert U vals To R Vals 1/u = r val