Chap 1 Part C - Sheet1 Flashcards
Derived units:
Speed meters per second (m/s) and Density grams per cubic centimeter (g/cm3)
Mass.
A measure of the amount of matter in an object.
Weight.
A measure of the gravitational force that the earth or other large body exerts on an object.
The meter is the standard measure of
length, or distance, in the SI and metric systems.
Volume is
the amount of space occupied by an object. The SI unit for volume.the cubic meter, m3.is so large that the liter (1 L = 0.001 m3 = 1 dm3) is much more commonly used.
value recorded should
use all the digits known with certainty, plus one estimated digit.
units for energy in both SI and metric
Energy is represented in SI units by the unit joule (J), but the metric unit calorie (cal) is still widely used.
one calorie is
amount of heat necessary to raise the temperature of 1 g of water by 1 C.
kilocalorie (kcal), called a large calorie (Cal)
food calorie by nutritionists, equals 1000 cal.
specific heat
The amount of heat needed to raise the temperature of 1 g of a substance by 1 C
one calorie water vs iron
One calorie raises the temperature of 1 g of water by 1 C, but raises the temperature of 1 g of iron by 10 C
Density is
the physical property that relates the mass of an object to its volume; mass per unit volume.
BMI
Obesity is defined by reference to body mass index (BMI)—Mass in kilograms divided by the square of height in meters.
how water react when frozen (comparied other substances)
Most substances contract when cooled, and expand when heated. Water expands when it freezes, so ice floats on liquid water.
Specific gravity is
the density of a substance divided by the density of water at the same temperature.
