How do physical scientists use observations and experiments to study nature?

In physical science, observations and experiments are fundamental tools used to understand the natural world through a process known as the scientific method.12

The Role of Observation and Experimentation

Physical scientists use these methods to develop and test scientific hypotheses—tentative explanations for natural phenomena.1
* Observation: This involves identifying phenomena and gathering data about the behavior of real objects. Observation is essential for setting up scientific problems and identifying which aspects of nature are interesting or worthy of study.3
* Experimentation: Scientists conduct experiments to test whether a hypothesis is supported or refuted by evidence. In controlled laboratory settings, researchers can manipulate variables to observe outcomes under specific conditions, such as studying the formation of minerals or the behavior of matter.14
* Natural Experiments: When controlled experimentation is impractical or unethical, scientists may utilize natural experiments—observational studies that exploit naturally occurring events or policy changes to gather data.5

The Interplay with Theory

Progress in physical science relies on a constant interplay between experiment and theory. Hypotheses serve as tools to gather data, which are then used to construct broader scientific theories that explain empirical laws. This cycle of testing, modifying, and retesting ensures that scientific understanding remains consistent with observed phenomena.32