0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Why is heat sometimes positive or negative?
Because heat can either be hot which is positive, or cold which is negative. Hot and cold are relative terms which means it is a comparison to another temperature.
When what flows into a system it's value is positive when heat flows out of the system it's value is negative?
heat. apex.
Why are the values for work done on isothermal and adiabatic compression negative?
Don't know but I believe the following is consistent with the history and development of thermodynamics. Thermodynamics first tackled analysis of a "heat engine" which, at the time, essentially meant a steam engine. By convention, an engine produced a work output which logically was positive (it would be poor marketing to sell a negative 1000 kw engine). The fuel used was positive - more acurately, the fuel produced by burning the fuel put positive heat into the engine. Again, by convention, heat in is positive and work out is positive. Note that heat coming out would be heat taken away ... subtracting heat or negative heat. So why does compressing a gas involve negative work? Gas expansion is the basic positive work producing process for heat engines and, since 1) compression is the opposite of expansion and 2) the total work needed to reversibly compress and expand a gas (back to the initial condition) is zero, then Work compression + Workexpansion = 0 so they better have opposite signs. The idea of work in and work out is closely tied to the idea of control volume. TSM
What is a negative - positive?
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Does a negative plus a negative equal a postive?
No, a negative plus a negative is a negative
When heat flows into a system its value is When heat flows out of a system its value is negative?
Heat is energy and cannot be negative, If you are talking about heat flow then if you define outflow to be negative then inflow is positive.
What is downward heat flow?
negative heat
Can the amount of heat needed to change temperature be negative?
Mathematically, yes. Adding "negative heat" just means removing heat. Surely there's been a time in the past when you dropped a lump or two of negative heat into your drink. And sure enough ... once all that negative heat got into it, its temperature went down !
When heat flows into a system its value is positive. When heat flows of a system its value is negative.?
when heat flows Out of a system
When flows into a system its value is positive. When heat flows out of a system its value is negative.?
heat
What reaction are characteristic of negative heat flow?
Exothermic
What does a negative value for heat represent?
The Short Answer = Cooling.
Can heat be negative?
Sure, if one object loses heat, another will gain it.However, it might then be called heat gain.
What are some of the possible negative effects of drought and extreme heat?
some of the possible negative effects of drought and extreme heat is that it will lead do poor production in terms of agriculture.
What are some positive and negative effects of using heat movers?
the positive thing about using heat movers is it makes it warmer. the negative is it makes your farts stank more.
Why is heat sometimes positive or negative?
Because heat can either be hot which is positive, or cold which is negative. Hot and cold are relative terms which means it is a comparison to another temperature.
Can you generate heat with batteries?
yes put aluminum foil extending from the positive to negative an feel the heat!!
