Physical Units and Quantities

Get Started. It's Free
or sign up with your email address
Rocket clouds
Physical Units and Quantities by Mind Map: Physical Units and Quantities

1. basic quantities

1.1. mass

1.1.1. SI unit:kilogram

1.1.2. measuring instrument

1.1.2.1. beam balance

1.1.2.2. sliding balance

1.2. time

1.2.1. SI unit: second

1.2.2. measuring instrument

1.2.2.1. digital stopwatch

1.2.2.2. sundial

1.3. electric current

1.4. temperature

1.5. luminous intensity

1.6. amount of substance

1.7. Length

1.7.1. SI unit: metre

1.7.2. measuring instrument

1.7.2.1. metre rule, accuracy 1mm

1.7.2.2. vernier caliper, accuracy 0.1mm

1.7.2.3. micrometer screw gauge accuracy 0.01mm

1.7.2.3.1. http://www.youtube.com/watch?v=4Buq4Zwi1Q0&hl=en-GB&gl=S

1.7.3. definition of metre

1.7.3.1. distance of light traveled in 1/299792458 of a second

2. aaaaaaa

3. SI unit

3.1. general unit

3.2. recommended unit

3.3. widely used unit

4. numerical prefixes

4.1. tera =10'12

4.2. giga=10'9

4.3. mega=10'6

4.4. kilo=10'3

4.5. hecto=10'2

4.6. deka=10'1

4.7. deci=10'-1

4.8. centi=10'-2

4.9. milli=10'-3

4.10. micro=10'-6

4.11. nano=10'-9

4.12. pico=10'-12

4.13. fento=10'-15