A '''scientific theory''' is more substantial than a conjecture or hypothesis, but may not be verified as consistent with empirical data. <ref>For example, scientists may refer to phlogiston theory or ether theory, even though empirical verification was lacking.</ref> | A '''scientific theory''' is more substantial than a conjecture or hypothesis, but may not be verified as consistent with empirical data. <ref>For example, scientists may refer to phlogiston theory or ether theory, even though empirical verification was lacking.</ref> |