Translated in Spanish, this exciting e-book shows readers how important volume is to flying a hot air balloon properly. Explore the history of the hot air balloon and learn how these eye-catching balloons fly! For hot air balloons to fly properly, passengers have to calculate the volume of the basket to see which balloon will be able to carry them. With vibrant images, easy-to-read informational text, clear mathematical diagrams, and text features such as a glossary and index, this Spanish-translated e-book will engage readers while simplifying important mathematical formulas and STEM themes.