92.0k views
5 votes
The oral thermometer is marked with a:

A. blue dot
B. red dot
C. green dot
D. pink dot

User Rafak
by
8.0k points

1 Answer

1 vote

Final answer:

The oral thermometer typically features a red dot, signifying the presence of red dye in the alcohol used within the thermometer. This color aids in reading temperature changes as the red-colored liquid expands and moves up the narrow tube in response to heat.

Step-by-step explanation:

The oral thermometer is marked with a red dot. This is because, in common types of thermometers, the alcohol that is used to measure temperature contains a red dye which expands more rapidly than the glass encasing it. When the temperature rises, the expansion of the alcohol forces it into a narrow tube, thereby increasing the length of the column and indicating the temperature change.

The use of red dye is not simply a random choice; red often signifies warmth or heat, which makes it a practical and intuitive color to represent an increase in temperature. This is similar to how water faucets are color-coded, with a red dot typically signifying hot water.

User Catalina Astengo
by
8.0k points

No related questions found