It should be chronologically arranged. Write every thing that you do step by step, exactly as you do it (the unvarnished truth, warts and all). For each experiment, write the purpose, method used, data gathered, source(s) of possible error with possible impact on results, data analysis, calculations, and conclusions.
Include anything that might have an effect on what you did, or the data that was collected (weather and atmospheric conditions, temperatures, lighting, ventilation, etc.). Document everything (date, time, materials and chemicals with lot and batch numbers, date and place of purchase, grade, purity, etc.). Log visitors in and out, note their reason for visiting, topics discussed, information exchanged, suggestions, actions, length of visit, results, agreements.
Any comments, observations, unexpected results, etc. that might be relevant may be interjected. Any comments that are not relevant should be avoided.
You write a journal of the data and observations and get it published by a science magazine or the web.
Write an experiment to find the velocity of sound?
Draw conclusions and write a report. If you are a high level scientist doing research , then the report is offered to a learned journal for promulgation/publication.
Theory
Scientists write a conclusion after an experiment. The conclusion will summarize the details of the experiment, and whether or not the hypothesis tested was correct. A scientific paper published in a peer-reviewed journal is where the rationale, methods and materials, results and conclusions for a scientific experiment are reported. At the beginning of the paper or article (the terms are interchangeable), most journals require an abstract, which summarizes the experiment and results in a paragraph. There is no point in performing experiments or observations if you don't report on them, initially perhaps for your own use, or within the lab or institution or company; but more widely as a formal, peer-reviewed paper in an appropriate learned journal. In professional cases you are contractually obliged to write reports for your employers at least. It's what they pay you to do.
Anything one wants to write in a journal may be written. There are no special guidelines of what to write in a journal. Most people write how they feel or a story.
There is no journal. You just write in in your own journal.
In a new journal you can put your thoughts. You can write down your hope and dreams in a new journal. You can write you daily experiences and problems in a journal as well.
In order to write a fictional journal, one must be able to write as if one were a person writing an actual journal. Understanding of subject matter and style is important.
Write conclusion to experiment.
Write anything that comes to your mind.
You write a journal of the data and observations and get it published by a science magazine or the web.
No, Winnie's Journal (also known as the Winnie Years Journal) is a journal that you can write in. There are also questions to answer, and pictures.
research journal
Write an experiment to find the velocity of sound?
Write conclusion to experiment.
Draw conclusions and write a report. If you are a high level scientist doing research , then the report is offered to a learned journal for promulgation/publication.