Converting Measurements. What unit would you use to measure these?

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Presentation transcript:

Converting Measurements

What unit would you use to measure these?

Length KilometreMetreCentimetreMillimetre m11/100m1/1000m

Length The SI unit is metre A kilometre is 1000m – so it is larger than a metre, if we have to convert from metre to kilometre we will multiply For example 1km = 1000m So 2km = 2x1000= 2000m And 3.5 km = 3.5x1000 = 3 500m

Centimetre A centimetre is one hundredth of a metre, it is smaller. So 1 metre = 100cm (1/100) For example: 2 m = 2 x 100 = 200cm 4.5 m = 4.5x100 = 450m 70cm = 1/ 100 x 70 = 0.7 m 120 cm = 1/100 x 120 = 1.2m

Millimetre A millimetre is one thousandth of a metre (1/1000) So there are 1000 mm in a metre There are 10 mm in a 1cm In 4 metres = 4 x 1000 = 4000m In 2 cm = 2 x 10 = 20mm

Question How many mm are there in 2km? 1 m = 1000 mm 1km = 1000m So 1km = 1000m x 1000mm = mm So 2 km = 2 x mm = mm

Mass TonneKilogramGramMilligram kg11/1000 kg1/

Questions How many g are there is 4 kg? 1 kg = 1000g So 4 kg = 4 x 1000g = 4000g How many mg in 4 kg? There are mg in 1 kg So 4 kg = 4 x =

Time How many minutes are there in an hour? How many seconds are there in an hour? How many seconds are there in a day?

Errors Errors from scientific measurements may be due to: the equipment, the experimenter the environment

Errors due to the Equipment This may be caused by inaccurate calibration of the equipment

Errors due to the Experimenter This usually manifests itself in poor experimental skills in reading measuring devices and may appear as parallax errors

Errors due to the environment The conditions in which an experiment is conducted may adversely affect the quantity of measurements For example measuring temperature (how hot) of a substance in an air conditioned room