Why we cool agar before pouring depends on WHY we are pouring it. If we are pouring a gel or standard media for streak culture then we allow some cooling to take place because we don't want to burn our fingers. If we are pouring a pour plate we allow a lot of cooling to take place so we don't kill our microbes through heat steralization. As my teacher used to say "boiled bugs don't grow".
If you're adding antibiotics (especially ampicillin) you have to let the agar cool so that it doesn't destroy the antibiotics. If you're adding bacteria to the agar to make pour plates then you have to let it cool down so that the bacteria don't die.
In pour plate technique the culture to be grwon is pour in melted agar medium, now when we add the diluted sample in agar plate and if the melted agar is very hot, it can lead to the damage of bacterial or fungal cell and may cause in abruption of growth, so the agar is cooled to get the optimum temp. for growth of microbial cell.
A penny is a solid material that is made out of copper and the copper is melted and poured into a mold and cooled.
to kill the micro - organisms
Assuming no loss of heat to the bowl or the air, the temperature of a mixture of two amounts of a substance will be the weighted average of the temperatures of the components - weighted according to their quantities. So the resulting temperature of the above mixture wil be between 55 and 60 degrees C.
Gasoline being poured into a tank is not a chemical change.
Because it was between 50 and 60 degrees before pouring it into the bowl.
Pour plating is a method of separating one species of bacteria from another by diluting one loopful of organism into three liquefied nutrient agar plates, with the hopes that one of the plates poured will provide an ideal sample for isolation.
No it won't hurt it. If you only poured a little in the radiator I wouldn't give it another thought. If you poured a quart or more in there you probably need to get your radiator flushed before the temperature starts hitting any extremes. Aluminum engine parts can be a little touchy if they aren't heated and cooled uniformly.
hot bioilling water
She poured a very expensive perfume all over her body before the party.He poured more milk into his cup.
Crayons are made of paraffin wax and pigment. The wax is hot when the pigment is added and mixed. Then the mixture is poured into crayon molds and cooled.
In pour plate technique the culture to be grwon is pour in melted agar medium, now when we add the diluted sample in agar plate and if the melted agar is very hot, it can lead to the damage of bacterial or fungal cell and may cause in abruption of growth, so the agar is cooled to get the optimum temp. for growth of microbial cell.
To make a synthetic plastic, plastic pellets are melted and then poured into a mold. The mold forms the product, and then the product is cooled and the mold opened.
the water molecules are getting cold
the bacteria will dentaure and die off
Wine.
because the magma cooled so fast the little pieces of cooled magma bonded already so there is not enough space for the little pieces to grow into crystals. Similar to concrete the bricks are the pieces of already cooled magma. But then the concrete is immediately poured onto the brick t=and cooled in 1 second and hardened. That does not allow space for the bricks to grow as everything is bonded and no more magma is left to add to the pieces to make them bigger.