practical skills Flashcards
define a “valid measurment”
it measures what it is supposed to be measured
what are accurate and precise results?
- accurate: close to the real value
- precise: close to other measurments
what is repeatability?
howprecise repeated meaurmnts are when they are taken by the
* same person
* same equipment
* under same conditions
what is reproducibility?
how precise meaurmnts are when they are taken by
* different people
* different equipment
what is the uncertainty of a measurment?
the interval within which the true value is expected to lie
what is a measurment error?
when there is a diference between the measured value and true value
types: systematic, random
what is a random error?
when the measured value varies around the true value in an unpredicatble way
what is systematic error?
a consistent difference between the measured and true values
define a ‘fair test’
only the independant varuable is allowed to affect the dependant variable
what are the prefixes and symbols from pico tera
- pico (p)
- nano (n)
- micro (μ)
- milli (m)
- centi (c)
- deci (d)
- kilo (k)
- mega (M)
- giga (G)
- tera (T)
What are the 7 base units ?
What are some scalar quantities?
What are some vector quantities?
