Why does the water remain in the inverted glass?
When you first turn the cup upside down, the pressure of the air inside the cup and the air pressure outside the cup are equal. The pressure of the air molecules both inside and outside the cup stays the same, gravity takes over, the card falls, and the water spills.
How do you stop condensation on agar plates?
A significant reduction in the amount of condensation can be achieved by allowing the sterilized agar to cool to 50°C–55°C before pouring. A water bath set at 50°C is useful to store bottles of molten agar to maintain the optimal temperature prior to pouring plates. Remember agar solidifies at around 42°C.
Why is there water in my Petri dish?
Under the high humidity conditions that exist in the culture container, a small temperature drop causes water to condense on the inside lid and sides of the container. Mild condensation causes “fogging” while continual or repeated rounds of condensation result in the formation of water droplets.
How do you do the floating water trick?
The “trick” to this experiment is air pressure. In this experiment, you’re basically going to pour water in a glass, put a slip of paper over the glass, turn the glass upside down, and watch as air pressure keeps the paper in place—and the water “floating” in the glass.
What is the water trick?
In the disappearing water trick, a magician makes water seem to disappear from inside a cup. It is a science-based magic trick that is based on a scientific principle, but it’s also a trick that’s simple and a lot of fun. Essentially, you pour some water into a cup and wait a few moments.
Why do you not seal agar plates completely?
Reason – The lid stops additional unwanted bacteria in the air contaminating the plate. Do not fully seal the lid, as this will stop oxygen reaching the bacterium, and this may encourage harmful anaerobic bacteria to grow.
Why are agar plates stored upside down?
Petri dishes need to be incubated upside-down to lessen contamination risks from airborne particles landing on them and to prevent the accumulation of water condensation that could disturb or compromise a culture.
Why must you Flame the loop between streaks?
Flame the loop or use a new disposable loop after you streak each quadrant. Using a new or sterilized loop allows you to effectively dilute the inoculum on the plate and obtain isolated colonies by spreading the inoculum thinner and more evenly.
Why does kitchen towel let water through but not sand?
Paper towels soak up water because they are loosely woven which enables water to travel between the fibers, even against gravity (capillary effect). Paper towels have similar purposes to conventional towels, such as drying hands, wiping windows and other surfaces, dusting and cleaning up spills.
What are the advantages of the pour plate method?
Pour plate Method: Principle, Procedure, Uses, and (Dis) Advantages. Pour plate method is usually the method of choice for counting the number of colony-forming bacteria present in a liquid specimen. In this method, fixed amount of inoculum (generally 1 ml) from a broth/sample is placed in the center of sterile Petri dish using a sterile pipette.
How do you pour plates from bottled media?
• Pouring Plates • Materials Needed: • Draft-free enclosure or Laminar flow hood • 70% isopropyl alcohol • Petri dishes • Microwave or hot water bath or autoclave 1. Melt the agar using one of the following methods: a)Autoclave: Loosen the cap on the agar bottle and autoclave the bottle at 15 psi for five minutes.
How much liquid do you need to pour on a plate?
Working on one plate at a time, carefully tilt open the cover (See Figure 1) and pour about 15–20 mL of liquid into the bottom portion (it should cover about 2⁄3 of the plate’s surface). Gently swirl the plate to spread out the liquid media so that it covers the entire bottom surface of the plate.
How is the pour plate method used for colony counting?
Last updated on August 26th, 2019 Pour plate method is usually the method of choice for counting the number of colony-forming bacteria present in a liquid specimen. In this method, fixed amount of inoculum (generally 1 ml) from a broth/sample is placed in the center of sterile Petri dish using a sterile pipette.
What is the conductivity of a HIK plate?
As discussed in When to Use Heat Pipes, HiK™ Plates, Vapor Chambers, and Conduction Cooling, the effective conductivity of HiK™ plates ranges from 600 to 1200 W/m K or more.
How does the HIK plate work in a heat spreader?
The HiK™ plate collects and moves the heat from these discrete heat sources to the liquid-cooled edge or air-cooled heat sinks with minimal temperature gradients. As electronics continue to move forward with higher power and smaller packaging, HiK™ plates are a great way to move heat to boost performance.
What’s the highest temperature of a HIK plate?
Scroll left to right and right to left using the arrow at the center of the image. Demonstrates the conventional aluminum plate vs. HiK™ Plate. The conventional aluminum plate’s highest temperature was 90.3° C whereas the HiK™ aluminum plate is 69.1° C.
Do you need a hot plate for camping?
Hot plates have become a necessity as it is one of the best ways to extend your cooking capacity. Whether you’re traveling, camping, enjoying an outdoor event, or just need a quick solution for your cooking needs, a hot plate will solve all your problems.
