measurement systems. suppose the label on a ball of string indicates that the length of the string...
TRANSCRIPT
![Page 1: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/1.jpg)
Measurement Systems
![Page 2: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/2.jpg)
Measurement Systems
• Suppose the label on a ball of string indicates that the length of the string is 150.
• Is the length 150 feet, 150 m, or 150 cm?
• For a measurement to make sense, it must include a number and a unit.
1.21.2Standards of MeasurementStandards of Measurement
![Page 3: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/3.jpg)
International System of Units
1795: In France, a bunch of world-
renowned scientists got together and
decided on a standard system of units.
(Le Système International d’Unités)
Volume liter L
Any combination of these units creates a derived unit.
![Page 4: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/4.jpg)
MeasurementAccurate measurements are a basic
requirement in science. A standard is an exact quantity people agree
to for comparison.
Standards define each unit.Mass of a kilogram is compared to the international prototype kilogram made of
platinum alloy
![Page 5: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/5.jpg)
MassThe kilogram (kg) is the SI unit of mass.
1 kg = 2.205 pounds
Measured using a balance/scale
![Page 6: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/6.jpg)
The meter (m) is the SI unit of length. It is defined as the length of the path travelled by light in a vacuum during a time
interval of 1/299,792,458 of a second .
How many cm are in 1 m?
Length is the distance between two points.
Measuring Distance
![Page 7: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/7.jpg)
VolumeThe SI unit for volume is the liter (L).
V = l x w x hLiquid volumes are measured using a graduated
cylinderSolid volumes are found by multiplication
1 mL = 1cm3
![Page 8: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/8.jpg)
Density
Density is the mass of a material divided by its volume.
substance density (g/cm3)
water 1.0
aluminum 2.7
lead 11.3
mercury 13.6
gold 19.3
D=mV
![Page 9: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/9.jpg)
The measurement unit for density: g/cm3 (a combination of SI units = a derived unit)
1.21.2Standards of MeasurementStandards of Measurement
![Page 10: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/10.jpg)
What’s Hot and What’s Not
Temperature is the measure of how much heat something contains.
1.21.2Standards of MeasurementStandards of Measurement
For most scientific work, temperature is measured on the Celsius (C) scale, where the freezing point of water is 0C, and the boiling point of water is 100C.
![Page 11: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/11.jpg)
Time and TemperatureThe SI unit for time is the second (s).
The SI unit for temperature is kelvin (K).
degrees Celsius + 273 = kelvins
Fahrenheit = 1.8C + 32
At what temperature does water freeze on the Kelvin scale? At what temp does it boil?
273 K, 373 K
![Page 12: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/12.jpg)
Question 1
1.21.2Section CheckSection Check
A __________ is an exact quantity that peopleagree to use to compare measurements.
A.) variableB.) standardC.) unitD.) control
SI standards are universally accepted and understood by scientists throughout the world.
B!
![Page 13: Measurement Systems. Suppose the label on a ball of string indicates that the length of the string is 150. Is the length 150 feet, 150 m, or 150 cm? For](https://reader033.vdocument.in/reader033/viewer/2022051516/56649e905503460f94b94a50/html5/thumbnails/13.jpg)
Question 2
1.21.2Section CheckSection Check
The amount of space occupied by an object iscalled _________?
The answer is volume. To find the volume of asolid rectangle, measure the rectangle’s lengthby its width by its height.
Answer