A Weighty Issue Ielts Reading Answers Portable !!install!! -

| Paragraph | Correct Heading | |-----------|----------------| | Paragraph A | | | Paragraph B | Unstable mass: a drifting definition | | Paragraph C | A portable solution using quantum physics | | Paragraph D | The ongoing quest for miniaturization |

According to the text, what is the most effective solution? a weighty issue ielts reading answers portable

What does the author suggest as a solution to the weight problem in society? The IPK is stored in a controlled environment

| Question Type | Your Answer | Key Clue in the Text | | :--- | :--- | :--- | | | | | | 1. The IPK is stored in a controlled environment. | TRUE | “...kept under three bell jars in a vault with strict temperature and humidity controls.” | | 2. All countries use the same physical kilogram prototype. | FALSE | “...only the original BIPM prototype has official status; national copies are secondary.” | | 3. Scientists have solved the issue of mass drift. | NOT GIVEN | The passage mentions efforts to redefine the kilogram but does not state the issue is solved. | | Sentence Completion | | | | 4. The original kilogram was designed to equal the mass of one ______ of water. | litre / liter | “...defined as the mass of one litre of pure water at its maximum density.” | | 5. Over time, the IPK appears to have lost ______ relative to its copies. | mass / weight | “...the IPK is 50 micrograms lighter than the average of its replicas.” | | Short Answer | | | | 6. What physical constant is now used to define the kilogram? | Planck’s constant | “...the 2019 redefinition ties the kilogram to Planck’s constant (h).” | | FALSE | “

– Moreover, the IPK’s mass appeared to drift relative to its official copies. When compared in the 1990s, the IPK was found to be 50 micrograms lighter than its sister copies. This discrepancy might seem tiny, but for high-precision science and international trade, it was a weighty problem. The definition itself was unstable.