A student adding iron filings to sulphur using a strong magnet to demonstrate that those same iron filings can be extracted from the sulphur with the same magnet. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hutchings, Richard |
Bildgröße: | 3614 px × 2689 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |