# a level aqa chem help

Q1.Which of these pieces of apparatus has the lowest percentage uncertainty in the measurement shown? A Volume of 25 cm3 measured with a burette with
an uncertainty of ±0.1 cm3.
B Volume of 25 cm3 measured with a measuring cylinder with an uncertainty of ±0.5 cm3.
C Mass of 0.150 g measured with a balance with an uncertainty of ±0.001 g.
D Temperature change of 23.2 °C measured with a thermometer with an uncertainty of ±0.1 °C.

the answer is A but i got C?? why
Original post by yasmineeeeeeee
Q1.Which of these pieces of apparatus has the lowest percentage uncertainty in the measurement shown? A Volume of 25 cm3 measured with a burette with
an uncertainty of ±0.1 cm3.
B Volume of 25 cm3 measured with a measuring cylinder with an uncertainty of ±0.5 cm3.
C Mass of 0.150 g measured with a balance with an uncertainty of ±0.001 g.
D Temperature change of 23.2 °C measured with a thermometer with an uncertainty of ±0.1 °C.

the answer is A but i got C?? why
nevermindd it is indeed A, you just work it out using the% uncertainity eqn and x 2 where appropriate