100 Science Terms & Their Meanings
1. Atom – The smallest unit of matter.
2. Molecule – Two or more atoms bonded together.
3. Element – A pure substance made of only one type of atom.
4. Compound – A substance made of two or more elements chemically combined.
5. Matter – Anything that has mass and occupies space.
6. Mass – The amount of matter in an object.
7. Volume – The amount of space an object occupies.
8. Density – Mass per unit volume.
9. Force – A push or pull.
10. Energy – The ability to do work.
11. Work – When a force moves an object.
12. Power – The rate of doing work.
13. Friction – A force that opposes motion.
14. Gravity – The force that pulls objects toward Earth.
15. Speed – Distance travelled per unit time.
16. Velocity – Speed in a given direction.
17. Acceleration – Change in velocity per unit time.
18. Inertia – Tendency of an object to resist change in motion.
19. Pressure – Force per unit area.
20. Temperature – Measure of heat energy.
21. Heat – Form of energy that causes temperature rise.
22. Sound – A form of energy produced by vibrations.
23. Light – A form of energy that enables us to see.
24. Refraction – Bending of light when it passes through different mediums.
25. Reflection – Bouncing back of light.
26. Electricity – Flow of electric charge.
27. Circuit – A complete path for electric current.
28. Conductor – Material that allows electricity to pass.
29. Insulator – Material that does not allow electricity to pass.
30. Magnet – An object that attracts iron.
31. Magnetic Field – The area around a magnet.
32. Ecosystem – Interaction of living and non-living things.
33. Habitat – Natural home of an organism.
34. Species – A group of similar organisms.
35. Population – Number of individuals of the same species in an area.
36. Community – A group of different populations living together.
37. Food Chain – Flow of energy from one organism to another.
38. Food Web – Interconnected food chains.
39. Producer – Plants that make their own food.
40. Consumer – Animals that eat plants or other animals.
41. Decomposer – Organisms that break down dead material.
42. Photosynthesis – Process by which plants make food.
43. Chlorophyll – Green pigment in plants.
44. Respiration – Process of releasing energy from food.
45. Transpiration – Loss of water from plant leaves.
46. Digestion – Breaking down of food in the body.
47. Circulation – Movement of blood in the body.
48. Nervous System – Controls body activities.
49. Cell – Basic unit of life.
50. Tissue – Group of similar cells.
51. Organ – Group of tissues.
52. Organism – Any living thing.
53. Reproduction – Producing new organisms.
54. Mutation – A change in DNA.
55. Evolution – Gradual change in species over time.
56. Adaptation – Features that help organisms survive.
57. Biodiversity – Variety of life forms.
58. Pollution – Harmful substances in the environment.
59. Ozone Layer – Protects Earth from harmful UV rays.
60. Climate Change – Long-term changes in Earth’s climate.
61. Erosion – Wearing away of soil and rocks.
62. Weathering – Breaking down of rocks.
63. Evaporation – Liquid turns into vapor.
64. Condensation – Vapor turns into liquid.
65. Precipitation – Rain, snow, sleet, or hail.
66. Water Cycle – Movement of water on Earth.
67. Solar Energy – Energy from the Sun.
68. Renewable Energy – Energy that can be replaced naturally.
69. Non-renewable Energy – Energy that cannot be replaced quickly.
70. Fossil Fuels – Coal, oil, natural gas.
71. Atom Number – Number of protons in an atom.
72. Isotope – Atoms with same proton but different neutrons.
73. pH – Measure of acidity or alkalinity.
74. Acid – Sour substance with pH < 7.
75. Base – Bitter and slippery substance with pH > 7.
76. Neutral – pH = 7.
77. Solution – Mixture where substances dissolve.
78. Solvent – The liquid that dissolves other substances.
79. Solute – Substance being dissolved.
80. Mixture – Combination of substances.
81. Circuit Breaker – Device that protects electrical circuits.
82. Radiation – Energy transfer in the form of waves.
83. Conduction – Transfer of heat through solids.
84. Convection – Transfer of heat in liquids or gases.
85. Orbit – Path of a planet around the Sun.
86. Rotation – Spinning of Earth on its axis.
87. Revolution – Earth’s movement around the Sun.
88. Galaxy – Large system of stars.
89. Universe – Everything that exists.
90. Satellite – An object that orbits a planet.
91. Telescope – Instrument to see distant objects.
92. Microscope – Instrument to magnify tiny objects.
93. Vaccine – Substance that protects from diseases.
94. Virus – Microscopic organism causing diseases.
95. Bacteria – Single-celled microorganisms.
96. Fungi – Organisms like mushrooms, molds.
97. Enzyme – Protein that speeds up reactions.
98. Hormone – Chemical messenger in the body.
99. Antibody – Protein that fights infection.
100. Gene – Unit of heredity.
—
Categories
Science and Technology
