The following formula is used to calculate the specific gravity of a material. SG = Ï / ÏW. Where SG = specific gravity, Ï = density of the material (kg/m3), ÏW = density of water ( kg/m3). The reference density of water at 4oC (39oF) is used as the reference as these are the conditions of maximum density.
Donât throw bank statements away after six years. August 12, 2013 85237 ViewsFacebook: 808Twitter: 41. The conventional wisdom is you only need to keep bank, credit card and other personal finance documents for six years. This is because HMRC (the taxman) can only ask you to go back that far if youâre being investigated for tax purposes.
Keep monthly statements for one year; you can dump them if your annual statement summarizes all activity. Keep the yearly summaries as long as you own the security, plus seven years. You need proof of your purchases to prove capital gains and losses on your tax return.nce you've purged, separate must-keep papers into three categories: those you need to keep for one calendar year, those you need to keep for a longer period and hard-to-replace documents like birth and marriage certificates. (See chart: What records to keep, how long to keep them .) Then decide on a home for each.