Choose a liquid to test. Put roughly 100 milliliters (3floz) into a beaker. Place the hydrometer into the beaker. Just as you marked the surface of the water level, make a mark to show how high the liquid in question comes on the hydrometer. You can tell a little about the relative density just by this initial mark. For example, if this mark is above the 1.0 mark, the liquid is less dense than water and if it is below the 1.0 mark it is denser than water. Less dense liquids will allow the tube to sink farther and more dense liquids will allow the tube to sink less, due to the Archimedes Principle, which states that the buoyant force of an object submerged in water is equal to the weight of the water that was displaced. If you want a more specific relative density, you can derive it mathematically. Measure the distance from the bottom of the tube to the 1.0 mark and the distance to the new mark. Divide the distance of the 1.0 mark by the distance of the new mark. This will give you the relative density of the liquid to water. For example, if your 1.0 mark is 5 millimetres (0.20in) from the bottom and your new mark is 4.5 millimetres (0.18in) from the bottom, you would divide 5 by 4.5 (or 0.20 by 0.18, if using inches). This gives you a relative density of roughly 1.1. Your liquid is 1.1 times as dense as water. In the other direction, if your 1.0 mark is 5 millimetres (0.20in) from the bottom and your new mark is 5.5 millimetres (0.22in) from the bottom, you would divide 5 by 5.5 (or 0.20 by 0.22, if using inches). This gives you a relative density of roughly 0.9. Your liquid is 0.9 times as dense as water.
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One-sentence summary -- Submerge the hydrometer in liquid. Mark the level of the liquid. Derive the relative density.

Q: To create the butterfly house, you will need pine wood which can be purchased at your local hardware store. Your materials do not need to be perfectly sanded down or anything of that nature. Using raw wood will work just fine. You will be able to create an entire butterfly house with two boards. One measuring 1" x 8" x 8' and the second measuring 1" x 10" x 4'. Consider recycling scrap wood you have around the house if available. If purchasing materials from a store, ask to have everything cut to size for easier assembling and time savings once at home. With a measuring tape, mark three equal parts, each measuring 30" in length. These three pieces will serve as the back and two sides. The remaining piece of this particular board will be used as the bottom of the house. You can customize your butterfly house as you see fit and adjust the measurements to create a larger or smaller version. Using the jigsaw, cut out each piece. Take every precaution when using power tools like this one. Read all instructions, wear gloves and goggles. If you are not trained in using this machine, a handsaw will work as well. From the same board, the remaining piece of wood will measure 8" x 5 ", cut this piece to measure 5 " x 5 5/8". Out of this piece, you will create the front of the house, the roof and roof block (the roof block with sit inside the house when closed to seal the unit shut). Measure and cut 30" x 5 5/8" to make the front. Measure and cut 5 " x 5 " to make the roof block. From the remaining piece of this board, measure and cut 9 " x 8 5/8" for the roof. Butterflies will use the slots to enter and exit the house. Grab the front piece you've just made (the 30" x 5 5/8" piece). Measure and mark six vertical rectangles. Each should measure 4" long x " wide. These can be spaced as you see fit. Using the inch drill bit, drill a hole through the top and the bottom of the rectangles to create 6 pairs of holes. Using the jigsaw, cut the space in between each of the paired holes to create the openings/slots. You can add more or less slots if you prefer. Keep in mind that making the slots any larger will encourage other, perhaps unwanted, animals to make this house their home.
A: Use untreated wood. Grab the 1"x 8" x 8' board. Cut out the floor. Grab the 1"x 10" x 4' board. Make the roof. Create the slots.

Article: An abused horse may have suffered physical abuse or neglect. Both leave scars in their own way. First off, get the horse examined by an equine vet. You will need to know the extent of any physical damage that has been done to the horse, and should have a frank discussion about the long term and ongoing cost of medication, should that be required. It is likely that basic health care, such as worming, vaccination, teeth and hoof care, are lacking. The veterinarian needs to examine the horse's teeth to see if they need filing down. The vet should also check the hooves to determine what remedial action is required to get them back into good condition. In addition to other physical examinations, the veterinarian may take a fecal sample away for analysis to investigate what types of worms the horse may have. He or she will also decide on appropriate worming treatments. Worming treatment will be discussed in Method 2. In the case of a starved horse the vet can also advise on how to gradually improve the horse's body condition in the way that is least likely to induce health problems. Weight gain will be discussed in Method 3.
Question: What is a summary of what this article is about?
Make an appointment with an equine vet for the abused horse. Have the vet check your horse for basic care issues. Find out if the horse has worms or other health issues.