Table 1: The relationship of area loss and mass loss.

Mass loss ratioThe relationship of mass loss ratio ρ and area loss ratio ρs

Less than 10% = 0.013 + 0.987 ρ
10%∼20% = 0.061 + 0.939 ρ
20%∼30% = 0.129 + 0.871 ρ
30%∼40% = 0.199 + 0.801 ρ