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.
Most banks will give account holders a copy of a bank statement upon request. There may be a time limit on how far back in time you can go. The U.S. government recommends you retain bank statements for at least one year.or example, if you claim the home office deduction on your tax return, you will need to retain the relevant bills with your tax papers. Bills you paid for home repairs or improvements should be kept as long as you own the home, according to the federal government's website USA.gov.