Physics
Physics describes the laws of motion, forces and matter. In Orb: On the Movements of the Earth, it sits at the center of the objections against heliocentrism (why don't we feel the Earth move?) and their answers, from the relativity of motion to inertia.
Entries in this discipline
Aristotelian physics
Rafal cites Aristotle to prove the Earth is at the center in Orb. We explain Aristotelian physics and its link to geocentrism.
The Earth's rotation and revolution
Hubert explains it in Orb: the Earth moves twice. We separate rotation (day and night) from revolution (seasons), and why we feel nothing.
The relativity of motion
Rafal grasps it by stumbling in Orb: if I am the one moving, the still scenery seems to move. We explain the relativity of motion.
Dust Explosion
Yes, when it hangs in the air at the right concentration. The three conditions, explosibility limits, silo disasters, and the warehouse in The Apothecary Diaries.
The Magic Mirror
In The Apothecary Diaries, a bronze mirror projects its engravings in reflected light. We explain the real physics behind this so-called magic mirror.
Salt, Ice, and Cold
Maomao makes ice cream with no refrigerator. We explain freezing-point depression, the NaCl-water eutectic point at -21°C, and colligative properties.
Morse code
Senku communicates in Morse code in Dr Stone. We explain how this code encodes letters as short and long signals, transmissible by sound, light, or current.