Observables are anything that can be perceived through the senses or detected by instruments. Synonyms for "observables" include objects, phenomena, specimens, entities, and instances. The term "observables" is widely used in scientific research to refer to variables that can be measured, observed and included in statistical analysis or experimentation. Other synonyms for "observables" include attributes, properties, and characteristics. In astronomy, observables refer to celestial objects that are visible to the naked eye, telescopes, or other instruments. In physical sciences, observables may refer to measurable quantities such as temperature, pressure, and volume. In social sciences, observables may include behaviors, attitudes, and opinions expressed through surveys or interviews.