SI units Flashcards
1
Q
measurement of SI units
A
quantitative/qualitative
2
Q
why SI units?
A
- standardisation
- comparable, consistent
3
Q
what is electric current measured in?
A
ampere (A)
4
Q
what is temperature measured in?
A
kelvin (K)
5
Q
what is the amount of substance measured in?
A
moles (Mol)
6
Q
what is luminous intensity measured in?
A
candela (cd)
7
Q
derived SI units
A
produced from a combination of the SI base units. Contains at least one of these base units: m, kg or s
8
Q
vector quantities
A
direction and magnitude
9
Q
scalar quantities
A
magnitude only
10
Q
force
A
initiates movement from a stationary body or alters the speed or direction of a moving body
11
Q
energy
A
- the ability to do work
- can be transferred to from one energy store to another
- cannot be destroyed
- can be stored by kinetic energy
12
Q
work
A
- energy transferred when a force moves
- work= force x distance
- one joule of energy is expended when a force of 1 newton moves a body by 1 metre
13
Q
power
A
- the rate of doing work
- expressed in Js-1 or watts
14
Q
non SI units in hospital context
A
7.5 mmHg - blood pressure
10.2 cmH2O - ventilator pressure
0.145 psi - oxygen cylinder pressure
