After many experiments and observations, robert boyle described that at a constant temperature, the pressure and volume of a gas are inversely proportional. this observation is represented in the formula pv = k where p equals pressure, v equals volume and k equals temperature. these findings are not the basis of a scientific theory because

they predict what will happen in nature without tests and supporting evidence

they establish a claim that can be tested and retested by the scientific community

they describe what happens in nature without explaining why it happens

they explain the relationship between pressure and volume of a gas based on observation