Questions that involve personal values, moral judgments, aesthetic preferences, or metaphysical claims cannot be answered through making measurements. These are questions where no amount of data collection, observation, or experimentation can produce a definitive answer, because the answer depends on something other than physical evidence. If you encountered this question in a science class, the core concept being tested is your ability to distinguish between empirical questions (answerable with data) and non-empirical questions (requiring judgment, belief, or opinion).
What Makes a Question Measurable
A question can be answered through measurement when it involves variables you can manipulate, observe, and record. “Does water freeze faster at higher altitudes?” is measurable because you can set up thermometers, timers, and containers at different elevations and collect data. The answer doesn’t depend on how anyone feels about it.
Measurable questions share a few key traits. They can be tested through experiments or direct observation of the natural world. They involve variables that can be controlled and compared. Their results are reproducible, meaning someone else running the same test should get the same outcome. And critically, the answer can be shown to be true or false. The philosopher Karl Popper called this “falsifiability,” and it remains the standard dividing line between scientific and non-scientific claims. If no possible observation could prove your claim wrong, it falls outside the reach of measurement.
Questions That Fall Outside Measurement
Several entire categories of questions resist measurement, no matter how sophisticated your tools are.
Moral and ethical questions ask what people should do, not what does happen. “Is euthanasia the right thing to do?” or “What universal rights should humans have?” are important questions, but as the UC Berkeley Understanding Science project puts it, scientific research will not answer them. Science can tell you what happens in natural systems. It cannot tell you what should happen, because that involves ethics, values, and human decisions.
Aesthetic and preference questions ask which things are beautiful, which music is best, or which painting is more meaningful. Researchers have spent years trying to identify universal visual features that correlate with beauty in artwork. No such universals have been found. Beauty ratings vary with personality traits, expertise, cultural background, and other personal characteristics. You can measure how many people prefer one painting over another, but that measures popularity, not some objective quality of beauty itself.
Metaphysical questions deal with the fundamental nature of reality in ways that can’t generate testable predictions. “Does God exist?” “Is there an afterlife?” “Is the universe a simulation?” These questions involve entities or claims that cannot be empirically detected. In philosophy, competing theories about whether reality is made of indivisible atoms, infinitely divisible “gunk,” or one enormous partless whole all fail to produce distinguishable, testable predictions. Without a possible observation that could separate one answer from another, measurement has no foothold.
Questions about subjective experience hit what philosophers call the “hard problem” of consciousness. Your brain processes color through patterns of electrical signals between neurons, but those signals are not themselves colors. There is no place in the nervous system where the physical processing translates into the felt quality of seeing red or tasting chocolate. You can measure brain activity associated with someone reporting they see red, but you cannot measure what red looks like to them from the inside.
How to Spot the Non-Measurable Question on a Test
If you’re working through a multiple-choice science question, you’ll typically see three options that involve observable, quantifiable things and one that involves opinion, values, or preference. Here’s how to tell them apart quickly.
- Measurable: “Which fertilizer produces taller plants?” You can grow plants, measure their height, and compare.
- Measurable: “At what temperature does sugar dissolve fastest?” You can time dissolution at different temperatures.
- Measurable: “How does exercise affect heart rate?” You can count heartbeats before and after activity.
- Not measurable: “Which flower is the prettiest?” No instrument can quantify prettiness. The answer changes from person to person.
The non-measurable option almost always contains a word like “best,” “prettiest,” “should,” “right,” or “most important” in a way that calls for a personal judgment rather than a number. If the answer would change depending on who you ask, and not because of a measurement error but because of genuine differences in values or taste, it cannot be resolved through measurement.
Why Science Uses Proxies for Subjective Things
Scientists do sometimes study things that seem unmeasurable, like stress or happiness, but they do it by measuring something else that stands in for the real thing. Cortisol levels serve as a proxy for stress. Survey scores serve as a proxy for life satisfaction. These proxies are useful, but they have real limitations. A perfect proxy would track the original variable with no error and no systematic distortion. In practice, proxies can miss important patterns, especially when the relationship between the proxy and the thing it represents isn’t perfectly linear. Measuring cortisol tells you something about the body’s stress response, but it doesn’t capture what stress feels like, whether it’s justified, or whether the situation causing it is fair.
This is the deeper point behind the classroom question. Science is extraordinarily powerful at answering questions about the physical world, but it operates within boundaries. It can describe what is and predict what will happen. It cannot, by itself, tell you what matters, what’s beautiful, or what’s right. Those questions require something measurement alone can’t provide.