When calculating the apparent expansion of a liquid in a container, it is generally assumed that the container's parameters remain constant. The apparent expansion refers to the change in volume or height of the liquid due to a change in temperature.
The assumption of a constant container means that its dimensions, such as length, width, and height, do not change significantly with temperature variations. This assumption allows us to focus on the expansion of the liquid itself and determine the apparent height difference between the starting and ending temperatures.
However, it's worth noting that in some cases, the container's parameters may indeed change with temperature. For example, if the container is made of a material with a high coefficient of thermal expansion, such as certain metals, then the container's dimensions could expand or contract noticeably with temperature changes. In such cases, the container's expansion would also need to be considered when calculating the overall apparent expansion.
In general, when performing calculations involving the apparent expansion of a liquid in a container, it's essential to consider the specific properties of both the liquid and the container, including their coefficients of thermal expansion, to obtain accurate results.