Question

in linear expansion, the data collected in the cooling down process because in heating process the thermal expansion and temprature change rapidly so it cant be collected in the cooling down process because in heating process the thermal expansion and temprature change rapidly so it cant be collected?

True or False

Answer 1

Solution:

False. But, usually, we will collect the data while cooling.

Because there will be an experimental difficulty to maintain a uniform rate of heating throughout the experiment. Apart from this another important feature related to structural phase transition. If we are increasing the temperature of an object, it may undergo structural phase transformation which inturn gives erroneous data.

Therefore, first, we will check the stability of the structure by increasing its temperature to the desired temperature. Once after confirming that there is no structural change, we will slowly cool the system and collect data and will use that data for calculating the linear expansion properties of that specific object.

Maintaining the uniform cooling rate is comparatively easier than maintaining the uniform rate while heating.