Which is NOT a parameter measured by a gloss meter?

A gloss meter is an instrument primarily used to measure the gloss or shininess of a surface. This device quantifies the reflective properties of materials, making it very effective in assessing the surface quality of coatings, varnishes, and even fuels in terms of their gloss levels.

The reflective properties of the fuel are crucial as they determine how much light is reflected off the surface, which is directly related to the fuel’s appearance and quality. The surface quality is also assessed by looking at how smooth or textured a surface is, which impacts light reflection characteristics.

On the other hand, viscosity is a measure of a fluid’s resistance to flow and is not relevant to the functioning of a gloss meter. Such parameters related to the physical state and behavior of the fluid, like viscosity, are typically assessed using different types of testing equipment that focus on flow properties, rather than the visual or reflective properties captured by a gloss meter. Thus, it is accurate to say that the viscosity of the fuel is not measured by a gloss meter.