When water freezes into ice it expands in volume by 9.05 percent. Suppose a volume of water is in a household water pipe or a cavity in a rock. If the water freezes, what pressure must be exerted on it to keep its volume from expanding? (If the pipe or rock cannot supply this pressure, the pipe will burst or the rock will split.) The bulk modulus for ice is 8x10^(9) N/m^(2) I tried solving this equation by using the formula Δp=-B(ΔV/V0). Which led to the answer Δp= -(8x10^(9) N/m^(2))*(0.0905)= -7.24*10^(8) N/m^(2). This turned out to be incorrect, and the correct answer is 6.6*10^(8) N/m^(2). What did I do wrong? is the volume change not 0.0905? If so what is it? Also how did the final answer turn out to be positive?