We can actually deduce here that making a airtight seal will take different format. You can:
- Use an epoxy-resin to create an airtight seal
- Create a glass-metal airtight seal
- Make a ceramic-metal airtight seal.
<h3>What is an airtight seal?</h3>
An airtight seal is actually known to be a seal or sealing that doesn't permit air or gas to pass through. Airtight seal are usually known as hermetic seal. They are usually applied to airtight glass containers but the advancement in technology has helped to broaden the materials.
We can see that epoxy-resin can used to create an airtight seal. They create airtight seals to copper, plastics, stainless steels, etc.
When making glass-metal airtight seal, the metal should compress round the solidified glass when it cools.
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Carbon is not used as semiconductor it has 4 valence electrons in it valence shell but the energy gap is very small it will conduct electricity even at room temperature ,the size of carbon is very small .
Answer and Explanation:
Calibration can be defined as a process where the accuracy of an instrument is measured and are compared with the known and set standards for calibration.
The instrument errors can be defined any deflection from the true value in the measurement or we can say that any difference between measured value and actual or true value results in instrument errors.
The instrument errors are further classified into 4 types:
a). Random errors
:
These error arise as the result of random, unpredictable or irregular changes in an experimental set up.
b). Systematic errors
:
These errors arises as a result of fault in the instrument or as a result of the effects of some external factors.
c). Gross errors:
These errors are a result of human errors in measurement while recording the reading, etc
d). Zero errors:
This error arises when the reading of the instrument is false while the measured value is equal to zero.
This is when the needle of an ammeter or voltmeter is not at zero but somewhere above or below it when the supply is not given.
Answer:
A(t) = 160 - 130 e^(-t/40)
Explanation:
At the start, the tank contains A(0) = 30 g of salt.
Salt flows in at a rate of
(1 g/L) * (4 L/min) = 5 g/min
and flows out at a rate of
(A(t)/160 g/L) * (4 L/min) = A(t)/40 g/min
so that the amount of salt in the tank at time t changes according to
A'(t) = 4 - A(t)/40
Solve the ODE for A(t):
A'(t) + A(t)/40 = 4
e^(t/40) A'(t) + e^(t/40)/40 A(t) = 4e^(t/40)
(e^(t/40) A(t))' = 4e^(t/40)
e^(t/40) A(t) = 160e^(t/40) + C
A(t) = 160 + Ce^(-t/40)
Given that A(0) = 30, we find
30 = 160 + C
C = -130
so that the amount of salt in the tank at time t is
A(t) = 160 - 130 e^(-t/40)
Answer:
Pharming
Phishing
Explanation:
Pharming is used equal like Phishing, because using fake websites, but in this case, is not necessary spam in your email.
Phishing is used like spam, and they pretend to be real companies by email, if you click in the email you will go a supposedly a real website, you put your information like passwords in these websites
You can prevent these techniques using antivirus and you can verify the websites because fake websites don't have the https:// protocol.
A business can prevent this issue using corporatize email and configuring the company network with security protocols and encrypt the information.