Physical Classification of Matter and the Three States of Water

Instructor Identification: The notes are presented by Sunil Bhaiya.
Official Communication Channel: A call to action is provided to join his official Telegram channel, specifically named "Riddle Wallah."
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The Riddle Challenge: The transcript introduces the topic of physical states through a descriptive riddle: "I can be hot, I can be cold, I can run and I can be still, I can be hard and I can be soft. I am found in all $3$ physical states naturally. What am I?"
Answer and Substance Identification: The substance described is water ( $H_2O$ ).
Exhaustive Breakdown of Properties mentioned in the Riddle:
- Hot vs. Cold: Water can exist at high temperatures (near boiling/hot water) and low temperatures (chilled water).
- Run vs. Still: Water exhibits fluidity and flow properties in its liquid state ("can run"), yet remains stationary or fixed in its solid state ("can be still").
- Hard vs. Soft: These terms describe the tactile and structural properties of the substance in its different phases. Solid water (ice) is hard, whereas liquid water is perceived as soft/fluid.
- Natural Ubiquity: Water is unique because it is found in all $3$ physical states naturally on Earth.

Solid State:
- Identified As: Ice.
- Classification: Solid.
Liquid State:
- Identified As: Water.
- Classification: Liquid.
Gaseous State:
- Identified As: Water-vapour.
- Classification: Gas.

Primary Topic: PHYSICAL CLASSIFICATION OF MATTER.
Context: The discussion of the three states of water serves as a foundational example for the broader scientific classification of matter based on physical state.
Concept Summary: Matter is classified physically into different states based on the arrangement and energy of its constituent particles. The transcript explicitly highlights the transition between solids, liquids, and gases using the example of water as a naturally recurring phenomenon that embodies all three categories.