1136 Definitions

Question 1

What is a compound?

Answer 1

Compounds are substances composed of two or more elements that are chemically combined in definite proportions.

Question 2

What is a mixture?

Answer 2

Mixtures are substances that contain atoms of more than one kind and that have been physically combined.

Question 3

What is plasma?

Answer 3

Plasma is matter in which electrons are stripped from their nuclei

Question 4

What is elasticity?

Answer 4

Elasticity is the property which tends to return a solid to its original size and shape when a stress is removed.

Question 5

What is Hooke’s law?

Answer 5

strain is proportional to stress provided the elastic limit is not exceeded

Question 6

What is strain?

Answer 6

The measure of deformation of a body by stress

Question 7

What is cohesion?

Answer 7

The force that holds molecules together

Question 8

What is pressure?

Answer 8

Force per unit area

Question 9

What does the principle of buoyancy state?

Answer 9

The lifting force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.

Question 10

What is Pascal’s principle?

Answer 10

The pressure applied to a fluid confined in a container is transmitted undiminished throughout the fluid and acts in all directions.

Question 11

Capillary action

Answer 11

the rise or depression of a liquid in a narrow tube.

Water rises when a narrow glass tube is placed in it, while mercury is depressed

Question 12

attraction between two different kinds of substances

Answer 12

adhesion

Question 13

upward force a liquid exerts on an object

Answer 13

buoyancy

Question 14

rise or depression of liquids in narrow tubes

Answer 14

capillary action

Question 15

attraction among molecules of a substance

Answer 15

cohesion

Question 16

science of forces acting on liquids

Answer 16

hydraulics

Question 17

shape of the surface of a liquid

Answer 17

meniscus

Question 18

force per unit area

Answer 18

pressure

Question 19

force producing relatively tough surface layer on liquids

Answer 19

surface tension

Question 20

reduce surface tension in water

Answer 20

heat and detergents

Question 21

liquid to gas

Answer 21

vaporization

Question 22

gas changes to liquid

Answer 22

condensation

Question 23

solid changes to liquid

Answer 23

fusion

Question 24

liquid changes to gas below the boiling point

Answer 24

evaporation

Question 25

solid changes to gas

Answer 25

sublimation

Question 26

liquid changes to solid

Answer 26

solidification

Question 27

amount of mass per unit volume

Answer 27

density

Question 28

density of substance compared to water

Answer 28

specific gravity

Question 29

Boyle’s law

Answer 29

the volume occupied by a fixed mass of gas is inversely proportional to the pressure, provided temperature is kept constant

Question 30

Charles’ law

Answer 30

the volume of a fixed mass of gas is directly proportional to its Kelvin temperature, provided pressure is constant

Question 31

What is an altimeter?

Answer 31

an instrument that measures altitude

Question 32

Bernoulli’s principle

Answer 32

velocity and pressure within a moving fluid are inversely related

Question 33

barometer

Answer 33

device that measures air pressure

Question 34

Boyle’s law formula

Answer 34

PV

Question 35

Charles’

Answer 35

V / T

Question 36

Gay Lussac’s

Answer 36

P / T

Question 37

viscosity

Answer 37

resistance of a fluid to flow

Question 38

friction

Answer 38

force that opposes motion