Astronaut Sophie Adenot demonstrated how to measure body mass in a weightless environment using a specialized device during a recent orbital mission [1].
Maintaining accurate mass measurements is critical for astronauts because microgravity affects muscle density and bone health over time. Monitoring these changes allows flight surgeons to adjust nutrition and exercise regimens to prevent long-term physical degradation.
The demonstration took place on day 57 during orbit 896 [1]. Adenot used the Mass Measurement Device, known as the MMD, to conduct the science experiment [1]. The process differs from Earth-based weighing because traditional scales rely on gravity to compress a spring or sensor, a mechanism that does not function in space.
"The device used in this video to measure mass is called the Mass Measurement Device (MMD) or Измеритель Масс (ИМ) in Russian," Adenot said [1].
The MMD determines mass by applying a known force to the astronaut and measuring the resulting acceleration. This application of Newton's second law allows the crew to calculate their mass regardless of the lack of gravitational pull, a necessity for medical tracking on the station.
This specific demonstration occurred on a Sunday morning during the 896th orbit of the mission [1]. The footage provides a technical look at the equipment used to ensure astronaut health during extended stays in space [1].
“The device used in this video to measure mass is called the Mass Measurement Device (MMD)”
The ability to accurately measure mass in microgravity is a fundamental requirement for long-duration spaceflight. Because weight disappears in orbit, astronauts must rely on inertial measurement to track muscle atrophy and bone loss, which are primary risks for missions to the Moon or Mars.
