1151(1) SI Units — Transcript

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1. 0:02these next videos deal with the topic of
2. 0:06matter and measurement giving sample
3. 0:08Alex problems
4. 0:09regarding
5. 0:11these topics in chemistry
6. 0:15a few things for your memorize sheet you
7. 0:18don't necessarily need to write these
8. 0:21down but you do need to start memorizing
9. 0:22these you need to know the SI units you
10. 0:26need to know their names like leader
11. 0:28unit abbreviations
12. 0:30like leader will usually just refer to
13. 0:33that as
14. 0:34both of those as what's the unit and you
15. 0:37could say leader l
16. 0:38and then what is that unit measuring is
17. 0:43it measuring volume or temperature or
18. 0:45length or
19. 0:46time
20. 0:49and then
21. 0:52learning the mathematical symbol that
22. 0:55goes with each of these leaders are a
23. 0:58measure of volume and the symbol for
24. 1:00that is V
25. 1:02so
26. 1:04from the explanation to the first
27. 1:06problem
28. 1:07here's a list
29. 1:08of units what they measure the dimension
30. 1:13that's the type of measurement they're
31. 1:15measuring a dimension
32. 1:18a name a symbol
33. 1:21and to this let's add
34. 1:23the mathematical symbol
35. 1:26length let's call that l
36. 1:30we we could call it d
37. 1:33um
38. 1:34for distance but let's just call it l
39. 1:38but whatever you want for that mass
40. 1:40we're going to use
41. 1:42m
42. 1:43time or duration we're going to use a
43. 1:45lowercase T upper and lower case matters
44. 1:48on these because
45. 1:51then sometimes there's confusion but you
46. 1:53know I'm using a lowercase L for length
47. 1:56uppercase L for liters but you know some
48. 1:58places you may see them used otherwise
49. 2:00so context matters
50. 2:02but there are certain conventions
51. 2:04M for mass is a convention that's used
52. 2:08standardly if you use capital M it's for
53. 2:11other things
54. 2:13lowercase M gets confusing because it's
55. 2:15used for lots of things
56. 2:17lowercase t for time uppercase t for
57. 2:20temperature
58. 2:22volume
59. 2:24uppercase V lowercase V is usually used
60. 2:27for velocity
61. 2:30so
62. 2:33you memorize these and you're ready to
63. 2:35go on to the problems
64. 2:41the symbol of a simple unprefixed SI
65. 2:44unit has been left off of each
66. 2:46measurement in the table below fill in
67. 2:48the missing unit symbols
68. 2:51height of a tree
69. 2:56meters
70. 2:58minimum mass of an official Major League
71. 3:01Baseball
72. 3:03masses grams
73. 3:06mass of an apple
74. 3:09grams width of a football field
75. 3:13meters what could you give us the
76. 3:15justification
77. 3:18just identify
78. 3:21the dimension
79. 3:28height Mass
80. 3:34width
81. 3:36just identify the relevant Dimension
82. 3:38from the words
83. 3:40and that justifies your choice of units