science Y1 general terms

physical quantity

a physical quantity can be measured by a device or an instrument. It consists of a numerical magnitude and a unit

accuracy

accuracy is how close the data is to the true value

precision

precision is how close the data is to one another

zero error

zero error isa type of error in which an instrument gives a non-zero reading when the measured quantity should be zero

parallax error

parallax error occurs when the marking on an instrument is viewed from the wrong angle

strikeback flame

a strikeback flame occurs when the air hole is not closed properly during ignition, leading to too much air entering through the air hole

non luminous flame

A non-luminous flame occurs when the air hole is not closed. It is blue in colour and hard to see from a distance. It’s temperature is higher than that of a luminous flame.

luminous flame

a luminous flame occurs when the air hole is closed. It is orange and yellow in colour. It has a lower temperature than a non-luminous flame. Due to incomplete combustion, soot is produced.

What is the SI unit for mass

Kilogram kg

SI unit for time

S

Seconds

SI unit for length

metre m

SI unit for electric current

A ampere

SI unit for temperature

K kelvin

what is mass

mass is the amt of matter in an object SI unit M

what is volume

volume is the amount of space an object takes up _{(SI UNIT M³)}