termometer X menggunakan titik tetap atas air mendidih bersuhu 170drjt X dan titik tetap bawah air mulai membeku bersuhu 20 drjt X, termometer X digunakan untuk

Rumus dasar=[tex] \frac{x-x_{min} }{ x_{max} - x_{min} } = \frac{c- c_{min} }{ c_{max} - c_{min} } [/tex]

[tex] \frac{90-20}{170-20} = \frac{c-0}{100-0} [/tex]
[tex] \frac{70}{150} = \frac{c}{100} [/tex]
[tex]7000=150c[/tex]

[tex]c= \frac{7000}{150} =46,666......7

≡ Diketahui:
[tex]\Leftrightarrow X_{t}=170^{\circ}\;\|\;X_{\circ}=20^{\circ}\;\|\;X=90^{\circ} \\ \Leftrightarrow C_{t}=100^{\circ}\;\|\;C_{\circ}=0^{\circ}[/tex]

≡ Penyelesaian:
[tex]\Rightarrow \frac{X-X_{\circ}}{X_{t}-X_{\circ}}=\frac{C-C_{\circ}}{C_{t}-c_{\circ}} \\ \Rightarrow \frac{90^{\circ}-20^{\circ}}{170^{\circ}-20^{\circ}}=\frac{C-0^{\circ}}{100^{\circ}-0^{\circ}} \\ \Rightarrow \frac{70^{\circ}}{150^{\circ}}=\frac{C}{100^{\circ}} \\ \Rightarrow C=\frac{(70^{\circ} \times 100^{\circ})}{150^{\circ}} \\ \leadsto \boxed{46,67^{\circ}C}[/tex]