[SPM Physics Heat Q21 Solution] Why the answer is A not B?

Hey there,

SPM Physics Heat Q21

  1. Which of the following liquids A, B, C or D can be used in a thermometer to measure temperatures from -50^{\circ} \mathrm{C} to 50^{\circ} \mathrm{C} ?
    Antara cecair A, B, C atau D yang manakah boleh digunakan dalam termometer untuk mengukur suhu dari -50 ^ { }^{\circ} hingga 50^{\circ} \mathrm{C} ?

SPM Physics Heat Q21 Solution

In order for the thermometer to be effective in measuring temperature from -50 C to 50 C, it needs to remain in the same state, i.e. in liquid state from -50 C to 50 C. This is assuming the thermometer reading is dependent on the volumetric expansion of liquid.

Let’s visualize with a simple image:

Hence, answer is definitely A.

1 Like

I understand now🥳…Thank you very much👍