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Heat and temperature

Lower Sec Science · Secondary 2 · Hard · Heat and temperature

A student uses a thermometer filled with alcohol to measure the temperature of a freezer at ",-30

^\circ\text{C}

" and a warm room at "25

^\circ\text{C}

". The freezing and boiling points of alcohol are "-115

^\circ\text{C}

" and "78

^\circ\text{C}

" respectively.

Which statement explains why alcohol is suitable in this thermometer?

Alcohol remains liquid at both $-30\ ^\circ\text{C}$ and $25\ ^\circ\text{C}$ .
Alcohol freezes at $0\ ^\circ\text{C}$ , so it is always safe to use.
Alcohol boils at $25\ ^\circ\text{C}$ , so it is ideal for room temperature only.
Alcohol changes state between $-30\ ^\circ\text{C}$ and $25\ ^\circ\text{C}$ , making it more sensitive.

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