Ask questions about projects relating to: aerodynamics or hydrodynamics, astronomy, chemistry, electricity, electronics, physics, or engineering.
Moderators: MelissaB, kgudger, Ray Trent, Moderators
My daughter is in the 6th grade and is doing a project on growing borax crystals.
We are trying to figure out how we should measure these crystals to see which conditions grow the "best". I thought about getting a digital scale that would weigh in grams but that is rather expensive (around $30.00) for something we will never use again.
I am worried that using a ruler or tape measure will not give detailed/accurate enough results.
- Posts: 3
- Joined: Wed Jan 02, 2013 11:33 am
- Occupation: Project Assistant
- Project Question: My daughter is growing borax crystals for her science fair project. What type of scale can we use to measure the crystals? She is concerned that just measuring them with ruler will not be good enough. If a scale is not necessary, then how should she measure the crystals to determine which grew the "best".
- Project Due Date: 01-09-13
- Project Status: I am conducting my experiment
It always makes me feel good when parents get involved with their childrens' science projects. Congratulations of your participation!
I believe the experiment you're daughter is running will show fairly significant differences in the crystal growth rate at the various temperatures. She will be able to see it fairly easily.
One way to "measure" things in science is subjectively, rather than objectively. Rather than use a ruler or a scale, your daughter could assign a subjectively assigned number value to the size of crystals. This is how gymnastics and diving events are scored.
A most important scientific concept to follow is to ensure that each experiment is repeated multiple times. Often, random variation can create a large effect on scientific outcomes. So performing multiple runs of the experiment, and carefully scoring each run using a well defined, but subjective, scoring system, will yield satisfactory results.
Good luck and HAVE FUN!
- Posts: 265
- Joined: Wed May 07, 2008 8:36 am
- Occupation: Engineer - Product & Technical Development Executive Director
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
If you have a digital camera, you could place a ruler along with a card documenting the test conditions on a table along with each container of crystals. Having the pictures with a scale does an excellent job of documenting your results for use in the project write up.
- Posts: 1297
- Joined: Mon Oct 16, 2006 11:47 am
Return to Grades 6-8: Physical Science
Who is online
Users browsing this forum: Yahoo [Bot] and 2 guests