[填空题]
Estimate the percent di jro3fbd*5 ikte c*b3gbo.f(;fference in the density of ir 6aiobz+;tgd h6)oet3qiv ;0 lon at STP, and when it is a solid deep in the Earth where the temp ioi03v ;bzg)d6+oaethtl6; qerature is 2000$^{\circ} $C and under 5000 atm of pressure. Assume the bulk modulus (90$\times 10^9N/m^2$) and the coefficient of volume expansion do not vary with temperature and are the same as at STP. %