Is there any constant that can be used to find our density with just the temperature available? Jet A1 considered.
I work at ARN. Once upon a time I might have said yes. The density goes up as the OAT goes down. But since the ARN fuel supply was changed to the railway from Gavle the density changes with every load of fuel. We can have 0.801 fuel one day and 0.809 the next. Temp is the same. It depends on which refinery it comes from.
Anyway you call yourself an MD80 driver. One narrow bodies it doesn't make a lot of difference. On a 10000 kg fuel load, the difference between 0.793 (midsummer) and 0.813 (midwinter) is only 200 litres. We don't bother at all on our narrow bodies, we use 0.800 all the time (means I can work it out without a calculator!)