using the estimate of 0.09 grams of hydrogen pressurized into a 50cc chamber with 5cc occupied by 50g of nickel (at 8.8g/cc) and 45cc unoccupied (for the hydrogen to fill) with a starting pressure of ~24atm at 20C the pressure will grow to ~64atm at 500C
atm deg K deg C 24.22 293 20 25.87 313 40 27.53 333 60 29.18 353 80 30.83 373 100 34.97 423 150 39.10 473 200 43.23 523 250 47.36 573 300 55.63 673 400 63.90 773 500 (are my calculations correct ? - https://spreadsheets.google.com/pub?hl=en_GB&hl=en_GB&key=0Aj441n89_v_VdHhXMHZ6MmlRWlh0RVJKYVBwd3B4amc&output=html)
