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17. Flux describes any effect that appears to pass or travel through a surface or substance. A flux is a concept in applied mathematics and vector calculus which has many applications to physics.
18. - A hypsometer
- Calorimeter
- Stirrer
- A lid and outer jacket
- Solid in small pieces
- Balance
- Weight box
- Two half degree thermometer
- Cold water
- Clamp stand
19. D to E
20. used for thermite welding, often used to join railway tracks. Thermites have also been used in metal refining, disabling munitions, and in incendiary weapons. Some thermite-like mixtures are used as pyrotechnic initiators in fireworks.
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