chapter 2 Flashcards
what is readability
smallest increment of mass that can be indicated
what is a microbalance
measures miligram quantities with a readability of micro gram
why do we weigh by the difference for hygroscopic agents
they rapidly absorb moisture from the air
erratic readings
balance door open, object hot or cold static charge on object
what is static charge
patting balance with antistatic brush
reading drifts down
liquid evaporates
reading drifts up
hygroscopic material absorbing moisture from the air
what is linearity error
max error that occur as a result of nonlinear balance response
what does a dashed line show
the ideal response proportional to the mass on the balance
what is buoyancy
upward force exerted on an object in liquid or gaseous fluid
when does buoyance error occur
whenever the density of the object being weighed is not equal to the density
what is a buret
precisely manufactured glass tube
what is relative uncertainty
uncertainty in quantity/ magnitude of quantity x100
