a helium balloon is filled on the ground where the atmospheric pressure is 768 torr. the volume of the balloon is 8.00 m3. when the balloon reaches an altitude of 4200 m, its volume is found to be 16.8 m3. assuming that the temperature remains constant, what is the air pressure at 4200 m in torr?

Mark the brainliest 19 points for you a student uses a liquid thermometer to measure the temperature of a substance in a beaker during science class. the teacher says that the measurement is incorrect. which are the most likely reasons the liquid thermometer could have measured the wrong temperature? check all that apply. the thermometer was not calibrated electronically. the software connected to the thermometer had errors. the bulb of the thermometer was touching the beaker. the thermometer's bulb was not submerged in the substance. the student stirred the substance with the thermometer.