What would happen to the accuracy of a float gauge if the fluid it is

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Heating the fluid being measured by a float gauge causes it to expand, leading to a rise in the liquid level that is inversely proportional to its density. As the density decreases, the float will sink slightly deeper, but this adjustment is insufficient to offset the significant rise in the fluid level. The accuracy of the float gauge reading will be further influenced by the shape of the container and the design of the float itself. Therefore, both temperature and physical characteristics of the system play crucial roles in the gauge's accuracy. Understanding these factors is essential for precise measurements in applications involving heated fluids.
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What would happen to the accuracy of a float gauge if the fluid it is measuring is heated?
 
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As the liquid expands and reduces it's density;
1. The level of the surface will rise significantly, inversely proportional to density.
2. The float will sink slightly deeper, but nowhere near enough to compensate for 1.

In addition to the temperature induced density change, the change in level reading will be dependent on the profile of the container and of the float.
 

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