A liquid consuming apparatus comprising: a detachably mountable liquid cartridge comprising: a first liquid chamber configured to store liquid therein; a second liquid chamber configured to store the liquid therein; a closed opening (45C; 40A, 40B) wherein said opening (45C; 40A, 40B) is for allowing flow from the first liquid chamber to the second liquid chamber; and a liquid supply opening configured to supply the liquid from the first liquid chamber and the second liquid chamber to an exterior of the liquid cartridge; a cartridge mounting portion configured to receive the liquid cartridge; a liquid consuming portion configured to consume the liquid supplied via the liquid supply opening from the liquid cartridge mounted to the cartridge mounting portion; a communication member configured to, when inserting the liquid cartridge, open said opening (45C; 40A, 40B) to bring the first liquid chamber and the second liquid chamber into liquid communication with each other whereby liquid flows from the first liquid chamber to the second liquid chamber; a detector configured to output a detection signal based on an amount of liquid which has flowed from the first liquid chamber to the second liquid chamber as a result of the communication member bringing the first liquid chamber and the second liquid chamber into liquid communication with each other; and a controller configured to: measure, based on the detection signal output from the detector, a physical quantity, based on which a flow rate of liquid flowing from the first liquid chamber to the second liquid chamber can be specified; and determine whether the physical quantity is within a threshold range. a detachably mountable liquid cartridge comprising: a first liquid chamber configured to store liquid therein; a second liquid chamber configured to store the liquid therein; a closed opening (45C; 40A, 40B) wherein said opening (45C; 40A, 40B) is for allowing flow from the first liquid chamber to the second liquid chamber; and a liquid supply opening configured to supply the liquid from the first liquid chamber and the second liquid chamber to an exterior of the liquid cartridge; a first liquid chamber configured to store liquid therein; a second liquid chamber configured to store the liquid therein; a closed opening (45C; 40A, 40B) wherein said opening (45C; 40A, 40B) is for allowing flow from the first liquid chamber to the second liquid chamber; and a liquid supply opening configured to supply the liquid from the first liquid chamber and the second liquid chamber to an exterior of the liquid cartridge; a cartridge mounting portion configured to receive the liquid cartridge; a liquid consuming portion configured to consume the liquid supplied via the liquid supply opening from the liquid cartridge mounted to the cartridge mounting portion; a communication member configured to, when inserting the liquid cartridge, open said opening (45C; 40A, 40B) to bring the first liquid chamber and the second liquid chamber into liquid communication with each other whereby liquid flows from the first liquid chamber to the second liquid chamber; a detector configured to output a detection signal based on an amount of liquid which has flowed from the first liquid chamber to the second liquid chamber as a result of the communication member bringing the first liquid chamber and the second liquid chamber into liquid communication with each other; and a controller configured to: measure, based on the detection signal output from the detector, a physical quantity, based on which a flow rate of liquid flowing from the first liquid chamber to the second liquid chamber can be specified; and determine whether the physical quantity is within a threshold range. measure, based on the detection signal output from the detector, a physical quantity, based on which a flow rate of liquid flowing from the first liquid chamber to the second liquid chamber can be specified; and determine whether the physical quantity is within a threshold range.