1 / 24

What is Science?

自然科學的教與學 — 從「科學故事」出發. Our Scientists – Ideas and Evidence How do scientists think and work in generating scientific knowledge?. What is Science?. 1. Common view on science:. Science is about: knowledge and facts with little reference to supporting evidence. 2. 3.

dorothywilliamson
Télécharger la présentation

What is Science?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 自然科學的教與學 — 從「科學故事」出發 Our Scientists – Ideas and Evidence How do scientists think and work in generating scientific knowledge? What is Science? 1

  2. Common view on science: Science is about: • knowledge and facts • with little reference to supporting evidence 2

  3. 3

  4. Scientific literacy Scientific knowledge nature of scientific knowledge methods of science Nature of Science 4

  5. Historical development of scientific ideas • Should focus on • creative construction of ideas • evaluation of evidence 5

  6. Our Scientists – Ideas and Evidence 6

  7. Charles Kuen Kao 高錕 • Born in Shanghai (1933) • Moved to Hong Kong (1948) • St Joseph’s College • Woolwich Polytechnic (London) • London University (1965) • Standard Telephones & Cables (UK) and IT&T (USA) • CUHK (1970-74; 1987-96) • Nobel Prize (2009) 7

  8. Total internal reflection (S3 IS) 8

  9. 1966 Charles Kao & George HockhamAt the Institute of Electrical Engineers:Replace copper wire with optical fibre for telecommunication • lighter • cheaper • less loss • faster 9

  10. Light signals can only travel for a few metres in optical fibre Science vs Technology Use silica (SiO2) to make optical fibre 10

  11. A dream comes true: 11

  12. Read to Learn 12

  13. NOS involved: • How was the idea generated? • How to test the idea? • The human nature of a scientist 13

  14. 14

  15. Alexander Bell – inventing the telephone Air vibration (sound) Vibration of a diaphragm Changing the resistance of a circuit Vibration of a metal foil to produce sound 15

  16. 16

  17. Marconi – transmitting wireless signals The Titanic disaster (1912) - rescued by Carpathia (93 km away) 706 of total 2223 passengers saved 17

  18. Generation of an idea: Maxwell (1864) – electromagnetic waves Hertz (1888) – generated radio waves 18

  19. Marconi (1895)- using radio waves to transmit electrical signals • Success through repeated trials • Seeking financial support • (1901) Marconi sent a signal from England across the Atlantic to North America over 2100 miles. 19

  20. Childbed fever Semmelweis (1846) Health & Diseases 20

  21. 21

  22. Key steps of scientific method 1. Make observations & ask questions 2. Put forward a hypothesis 3. Collect evidence – by experiments or other means 4. Analyse results & draw conclusions 22

  23. Microbes and disease The control of smallpox Marshall & control of peptic ulcer A case study of the spread of SARS in Hong Kong Other examples from Health & Diseases and Public Health Liberal Studies – using scientific inquiry to understand health and diseases 23

  24. Our Scientists – Ideas and Evidence • To go through the thinking process of our great scientists • To experience the joy and excitement in discovery • To inspire our students to develop an inquisitive attitude and investigative approach in the study of science • To dream the impossible dream 24

More Related