A 40degree Celsius thermometer reads 0.7degree Celsius at it boiling point of water. Evaluate the correct thermometerwhen it reads at 30degree Celsius

To evaluate the correct thermometer reading at 30 degrees Celsius, we first need to understand the relationship between the Celsius scale and the boiling point of water.

The Celsius scale is divided into equal intervals between the freezing point and boiling point of water. On the Celsius scale, the freezing point of water is defined as 0 degrees Celsius, while the boiling point of water is defined as 100 degrees Celsius at standard atmospheric pressure.

However, in the given information, it states that a 40 degrees Celsius thermometer reads 0.7 degrees Celsius at the boiling point of water. This suggests that the calibration or accuracy of the thermometer is off.

To find the correct thermometer reading at 30 degrees Celsius, we need to determine the temperature difference or offset between the given reading and the actual boiling point of water.

The given thermometer reading at the boiling point is 0.7 degrees Celsius, which is lower than the expected 100 degrees Celsius by 99.3 degrees.

We can calculate the offset as follows:
Offset = Actual boiling point - Given boiling point reading
Offset = 100 degrees Celsius - 0.7 degrees Celsius
Offset = 99.3 degrees Celsius

This means that the given thermometer has an offset of -99.3 degrees Celsius at the boiling point.

To apply this offset to the reading at 30 degrees Celsius:
Correct thermometer reading = Given thermometer reading at 30 degrees Celsius + Offset
Correct thermometer reading = 30 degrees Celsius + (-99.3 degrees Celsius)
Correct thermometer reading = -69.3 degrees Celsius

Therefore, the correct reading on the given 40-degree Celsius thermometer when it reaches 30 degrees Celsius would be -69.3 degrees Celsius.