Final answer:
To conduct a density/unit weight test, a graduated cylinder, a scale for weighing objects, and water for displacement are used. The hydrometer is another tool for measuring liquid density. For estimating thermal conductivity, additional tools like a spring scale and ruler may be required.
Step-by-step explanation:
To properly conduct a density/unit weight test, several pieces of equipment are necessary. A common method for determining density is the water displacement technique. This method involves using a graduated cylinder, a scale to weigh an object, and water for submersion of the object.
In some cases, a hydrometer might be used instead, which measures the specific density of liquids. Additionally, if you're estimating thermal conductivity, a spring scale and a ruler could be used to measure other necessary physical properties that may correlate with density.
For the water displacement method, the procedure usually follows these steps: An object, such as a piece of rebar, is weighed first. It is then submerged in water within a graduated cylinder, displacing a certain volume of water equal to the volume of the object.
By recording the change in water level (volume displaced) and the weight of the object, the density can be calculated using the formula Density = Mass/Volume.