English School, (19th century). Medium: engraving. Date: 19th Century. Inflating a balloon with hydrogen, produced by covering barrels of iron filings with sulphuric acid and feeding the gas into the balloon; Provenance: Private Collection.
Assign directly to your students using the code or link above, without having them log in. Simply tell your students to go to
www.pbsstudents.org and enter the Assignment Code, or click on the Assignment URL to share the assignment as a link.