| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | ion | scientific community | Ions are electrically charged atoms or molecules, with the number of protons not equal to the number of electrons. | 1 |
| 2 | thunder | scientific community | Sound caused by lightning heating the air around it | 1 |
| 3 | thunder | scientific context | Thunder is the sound caused by the rapid expansion of air surrounding a lightning bolt. | 1 |
| 4 | thunder and lightning | modern scientific understanding | Thunder is the sound caused by the rapid expansion of air surrounding a lightning bolt, while lightning is a discharge of electricity in the atmosphere. | 1 |