No, it is not possible to determine if an object is a gas or a liquid solely based on temperature and pressure without considering other factors such as mass or volume.
The state of matter of a substance (whether it is a gas, liquid, or solid) is determined by its temperature, pressure, and the specific properties of the substance itself. These specific properties include the molecular structure, intermolecular forces, and the critical point of the substance.
Temperature and pressure alone cannot provide enough information to differentiate between a gas and a liquid. For example, at a certain temperature and pressure, a substance could exist as a gas if it is above its boiling point or as a liquid if it is below its boiling point. Similarly, at certain temperature and pressure conditions, a substance could exist as a gas if it is below its condensation point or as a liquid if it is above its condensation point.
To accurately determine the state of matter, additional information such as the substance's boiling point, critical temperature, or phase diagram is required. Mass and volume measurements are also useful in determining the density of the substance, which can provide further insights into its state.