https://www.khanacademy.org/science/biology/intro-to-biology/science-of-biology/v/the-scientific-method
2023-09-24T07:18:20.902045194Z
The scientific method
The scientific method is a logical approach to understanding the world. It starts with an observation, followed by a question. A testable explanation or hypothesis is then created. An experiment is designed to test the hypothesis, and based on the results, the hypothesis is refined. This process is repeated, leading to a deeper understanding of the observed phenomenon. This method ensures our knowledge is built on a solid foundation.
Sal Khan
video
https://cdn.kastatic.org/googleusercontent/ZNIs_jJJ4FC9r76opQp-voduNhewR1yg7uVXDBEM_Y24hZBA8y49h1pO5UogWhkhcIZ8d3xL2ZkdCfOHgPdPtws
The scientific method
The scientific method is a logical approach to understanding the world. It starts with an observation, followed by a question. A testable explanation or hypothesis is then created. An experiment is designed to test the hypothesis, and based on the results, the hypothesis is refined. This process is repeated, leading to a deeper understanding of the observed phenomenon. This method ensures our knowledge is built on a solid foundation.
https://cdn.kastatic.org/ka-youtube-converted/N6IAzlugWw0.mp4/N6IAzlugWw0.mp4
709
Scientific investigations
https://www.khanacademy.org/science/als-k-to-12-science/x46c2fc9f8e023990:1st-quarter/x46c2fc9f8e023990:understanding-the-components-of-a-scientific-investigation/e/the-scientific-method-and-experimental-design
2026-04-08T00:54:09.631945657Z
The scientific method and experimental design
Test your knowledge on the scientific method and experimental design!
Ashley
exercise
https://www.khanacademy.org/science/biology/intro-to-biology/science-of-biology/a/the-science-of-biology
2021-04-29T07:51:28Z
The scientific method
How the scientific method is used to test a hypothesis.
article
https://www.khanacademy.org/math/cc-third-grade-math/imp-measurement-and-data/imp-mass/v/intuition-for-grams
2021-06-30T20:49:32Z
Understanding mass (grams and kilograms)
Sal talks about what mass means. He also examines the masses of real objects in grams and kilograms.
video
https://cdn.kastatic.org/googleusercontent/Y6-8ycMHIAPVXb6OuFU7Vg8UOAjJt5zgHJim313Sw9lHQXuSvp11aVpXLu9cdOciG2UaxqaGzBGNHcflGtj5FwyeLA
Understanding mass (grams and kilograms)
Sal talks about what mass means. He also examines the masses of real objects in grams and kilograms.
https://cdn.kastatic.org/ka-youtube-converted/zqduFg0s5Q4.mp4/zqduFg0s5Q4.mp4
435
Scientific investigations
https://www.khanacademy.org/math/cc-third-grade-math/imp-measurement-and-data/imp-mass/e/estimating-mass
2021-06-30T20:49:31Z
Estimate mass (grams and kilograms)
Practice estimating the mass of real life objects using grams and kilograms.
Lindsay
exercise
https://www.khanacademy.org/math/cc-fourth-grade-math/imp-measurement-and-data-2/imp-converting-units-of-mass/a/metric-units-of-mass-review
2021-06-30T20:49:33Z
Metric units of mass review (g and kg)
Review the size of grams and kilograms and how to convert between the two. Then, try some practice problems.
article
https://www.khanacademy.org/math/cc-third-grade-math/imp-measurement-and-data/imp-mass/v/mass-problems
2025-11-29T06:30:36.870552694Z
Word problems with mass
Sal solves word problems involving mass. Estimate the mass of items.
video
https://cdn.kastatic.org/googleusercontent/JJvKfyH3YWmZ93DqAgelNbtVKcj5P3gaIj9LNPIt4uBesdhHbbGO9mN-Gi8WCglXzwHqGFheDagZpOG-Scip4Z4
Word problems with mass
Sal solves word problems involving mass. Estimate the mass of items.
https://cdn.kastatic.org/ka-youtube-converted/2-DvXDh1bn0.mp4/2-DvXDh1bn0.mp4
241
Scientific investigations
https://www.khanacademy.org/math/cc-third-grade-math/imp-measurement-and-data/imp-mass/e/measure-mass
2026-04-08T00:54:09.631945657Z
Word problems with mass
Solve word problems involving mass. Read the mass of items from an analog scale.
Lindsay Spears
exercise
https://www.khanacademy.org/math/cc-fourth-grade-math/imp-measurement-and-data-2/imp-estimating-mass/a/units-of-measurement-faq
2023-01-05T23:01:05.443683948Z
Units of measurement: FAQ
Frequently asked questions about units of measurement.
article
https://www.khanacademy.org/science/revision-up-science-class-6-full-term/x00110b31861f2508:week-3/x00110b31861f2508:temperature-and-measurement/v/measuring-temperature
2025-05-18T06:30:48.900720574Z
Measuring temperature
Heat check? Science has the final say! Explore how we really measure hot, cold & everything in between!
Vibhor Pandey
video
https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw
Measuring temperature
Heat check? Science has the final say! Explore how we really measure hot, cold & everything in between!
https://cdn.kastatic.org/ka-youtube-converted/kdOzQf1ZRtk.mp4/kdOzQf1ZRtk.mp4
436
Scientific investigations
https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-3/x017c12e57b64cfa8:measurement/e/measurement-of-length-mass-time-and-temperature
2026-04-27T08:40:32.356784737Z
Measurement of length, mass, time and temperature
LO: Standard units of length, mass, time and measurement.
Revathi
exercise
https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:heat-and-temperature/x0c8b40bd4b242f0b:measurement-of-heat-and-temperature-and-dependance-of-heat/v/activity-heat-transferred-depends-on-mass
2023-06-26T04:10:39.513125705Z
Activity: Heat transferred depends on mass
Let's say you want to increase the temperature of different amounts of the same substance by 5 degrees Celsius. What can the amount of heat required depend upon?
Vibhor Pandey
video
https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw
Activity: Heat transferred depends on mass
Let's say you want to increase the temperature of different amounts of the same substance by 5 degrees Celsius. What can the amount of heat required depend upon?
https://cdn.kastatic.org/ka-youtube-converted/XxKDL5RN_eo.mp4/XxKDL5RN_eo.mp4
173
Scientific investigations
https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:heat-and-temperature/x0c8b40bd4b242f0b:measurement-of-heat-and-temperature-and-dependance-of-heat/v/explanation-heat-transferred-depends-on-specific-heat
2023-06-26T04:10:39.513125705Z
Explanation: Heat transferred depends on specific heat
Let's look at the explanation the activity: Heat transferred depends on specific heat
Vibhor Pandey
video
https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw
Explanation: Heat transferred depends on specific heat
Let's look at the explanation the activity: Heat transferred depends on specific heat
https://cdn.kastatic.org/ka-youtube-converted/6GhqhQuCZuk.mp4/6GhqhQuCZuk.mp4
81
Scientific investigations
https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:thermal-properties-of-matter/x0e04e0cb682fb793:tmperature/e/measurement-of-heat-and-temperature
2026-04-29T10:50:35.589391704Z
Measurement of heat and temperature
Let's solve some questions on measurement of heat and temperature
Vibhor Pandey
exercise
https://www.khanacademy.org/science/teacher-resources-ngss-science-domain/x2811526c37de0eab:hands-on-science-activities/x2811526c37de0eab:middle-school-earth-and-space-science-activities/a/activity-how-can-we-reduce-our-garbage-footprint
2026-02-27T18:00:31.886851552Z