Final answer:
The substance that does not have the same ratio of weight to volume (density) as the others is oil, as it has a lower density compared to water, eggs, and butter.
Step-by-step explanation:
The question, 'which of the following does NOT have the same weight as volume? a. oil, b. eggs, c. butter, d. water,' is asking which substance out of the given choices does not maintain a consistent ratio between its weight and its volume.
The term 'weight as volume' in the context given here is likely a misphrasing and should be understood as 'density,' which is the ratio of an object's mass to its volume. The answer is oil because typically, substances like water, eggs, and butter have a density close to or higher than water (1.0 g/mL at room temperature),
meaning they will have a similar weight for a given volume. Oil, on the contrary, has a density lower than water, which is why it floats when mixed, and thus for a given volume, oil would weigh less than an equal volume of the other substances mentioned.