A box, when hung from a spring balance shows a reading of $50 \mathrm{~kg}$. If the same box is hung from the same spring balance inside an evacuated chamber, the reading on the scale will be

• A

  $50 \mathrm{~kg}$ because the mass of the box remains unchanged
• B

  $50 \mathrm{~kg}$ because the effect of the absence of the atmosphere will be indentical on the box and the spring balance
• C

  Less than $50 \mathrm{~kg}$ because the weight of the column of air on the box will be absent
• Correct answer
  D

  More than $50 \mathrm{~kg}$ because the atmospheric buoyancy force will be absent

Hence, the correct answer is option: 'D'.