Chapter at a glance
An introduction to the secondary-stage science book. Science is not only what we know but how we know it: observations lead to measurements, patterns are expressed with symbols and equations, models represent complex systems, and ideas are tested, revised or discarded.
What this chapter covers
- How science moves from curiosity to deep exploration
- Observation, measurement, models and testing ideas
- The magnifying glass (careful observation) and compass (direction and limits of ideas) that frame the book
Key points
- Exploration combines physics, chemistry, biology and earth science in one book.
- Scientific ideas are always open to testing and revision.
Read the NCERT chapter
Read this chapter in the official NCERT textbook Exploration (2026-27 edition) for free on ncert.nic.in.
Source: NCERT, Exploration, Grade 9 (2026-27). NCERT chapter PDF. Spotted a mistake? Email edura.class9.yt@gmail.com. Last updated 11 October 2026.