What 3 things determine the shape and size of a puddle when blood is dripped onto a surface?

What 3 things determine the shape and size of a puddle when blood is dripped onto a surface?

The shape and size of the puddle depends on the amount of liquid, the height of the container, and whether you spill on carpet, wood, linoleum or some other surface. In general, more liquid, or a fall from a greater height, will make a larger puddle.

How do you calculate the impact angle of blood?

Use trigonometric functions to determine if the impact angle for any given blood droplet. By accurately measuring the length and width of a bloodstain, you can calculate the impact angle using the following sine formula: c=opposite/hypotenuse=width(a-b)/length(b-c).

What is the shape of a passive drop?

Passive drops will vary in shape and size depending on the volume of blood and the surface texture, but will generally be circular.

What is a passive drop?

Passive Drop (Bleeding) — Bloodstain drop(s) created or formed by the force of gravity acting along. Page 3. Perimeter Stain — A bloodstain that consists of only its outer periphery, the central area having been removed by wiping or flaking after liquid blood has partially or completely dried.

Is it weld spatter or splatter?

Though some people use these two names to imply the same thing, they are not the same. Spatter refers to the small particles that tend to fly out during welding, while splatter refers to the molten liquid that splashes and builds upon the welding surface.

Why do welders spatter?

Spatter is caused by several factors. The main factor is a disturbance in the molten weld pool during the transfer of wire into the weld. This is usually seen when the welding voltage is too low or the amperage is too high for a given wire and gas combination.

What is excessive spatter?

MIG setups use electrode wire that bonds with the metal to form the weld, and spatter is the excess molten wire that bonds with everything else. Too much spatter can lead to downtime for cleanup and wasted materials. And, if it bonds with your workpiece it can be especially painful.

Why is my MIG welding splattering?

MIG settings A common cause of MIG welding spatter is excessive speed or irregularity with your wire feed. Spatter occurs when the filler wire enters the weld pool. The solid wire melts at a rapid rate due to the extreme heat. As it melts, the filler wire turns into a liquid form, creating the pool.

Is stick welding harder than MIG?

Is MIG welding easier to learn than stick? MIG is easier as a process than stick welding once you’re up and running. However, the MIG machine is harder to set up than stick. To set up a stick machine all you need is your portable stick welder, a power source and an electrode then you’re good to go.

When welding do you push or pull?

Push or pull: Here the rule is simple. “If it produces slag, you drag,” says Leisner. In other words, you drag the rod or wire when welding with a stick or flux-core wire welder. Otherwise, you push the wire with metal inert gas (MIG) welding.

Can’t see what I am welding?

Make sure your cover lens (the clear one on the outside) is clean and not scratched or yellowed. This clear plastic lens protects the glass shaded lens from pitting by welding sparks. As someone else said, try to direct some light on the article being welded.

How dark should my welding helmet be?

Both ANSI and AWS are more cautious, recommending a shade number 11 for welding at 60-160 amps, a number 12 for 160-250 amps, and a number 14 for 250-500 amps. Verify that both the welding helmet and lens shade meet ANSI Z87. To protect your eyes, look for helmets meeting ANSI Z87.

Why can’t I see through my welding helmet?

Problem 4: You Can’t See Enough of Your Weld If you must turn your head to see what you are welding, the problem may be the size of your lens. While the lens is meant to let you see what you are doing, the lack of visibility can get frustrating. Luckily, you can fix the problem just by using a wider lens.

Can you weld with bad vision?

A welder’s hands and eyes are critical to producing quality welds that pass visual and nondestructive weld examinations. However, that does not mean someone with less than 20/20 vision cannot effectively weld or prepare materials for welding processes.

How does welding improve eyesight?

4 Welding Helmet Hacks For Better Vision

1. Starting with the easiest solution first, make sure you make a regular habit of replacing outside and inside protection plates on your welding helmet.
2. If you still can’t see with the detail you need, most welding helmets now allow for the insertion of a magnifying lens.