Final answer:
The property that remains the same for both samples of ethyl alcohol is Density, which is an intensive property and not influenced by the amount of substance.
Step-by-step explanation:
The property that is the same for both samples of ethyl alcohol in the beakers is Density. Density is an intensive property, which means it does not change with the amount of the substance. This is because density is defined as the mass per unit volume of a substance, and for a pure substance like ethyl alcohol, its density will be constant regardless of the sample size. On the other hand, properties such as color and odor can be influenced by external factors and are not intrinsic properties of a substance. Refractive index, while a physical constant for a pure substance, can vary slightly due to impurities or temperature changes. Therefore, density is the most appropriate answer to the question.