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m₁c₁Δt₁=m₂c₂Δt₂
m₁=m₂c₂Δt₂/c₁Δt₁
Δt₁=1000⁰C-23⁰C=7=977⁰C
Δt₂=23⁰C-20⁰C=3⁰C
c₁=449J/kgK
m₁=10kg×4200J/kgK×3⁰C:449J/kgK×977⁰C
m₁=126000kg:438673
m₁=0,29kg