Physics about temperature 急!!!急!!!

a)
from the graph, the length is 2.5 cm when the column is at the lower fixed point

then, (4 - 2.5) / (25 - 0) = (L - 2.5) / (100 - 0)

L = 8.5 cm

b)
Rotary thermometer: angle of deflection / degree
resistance thermometer: resistance / ohm

From the graph, 4 cm represents 25 deg.C, hence [one large square] on the X-axis represents 25 deg.C.
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At 0 deg.C (the origin of the graph), the alcohol length = 2 cm
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At 100 deg.C (position of 4 large squares), alcohol length = 10 cm
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2. The angle of deflection and the current.